"Then let's go!"

My heart was pounding in my ears. I don't think I've ever been so frightened in my life. I had a feeling Broxholm would jump out and grab us at any second. For one horrible instant I wondered if the mirror on his dressing table might be at the right angle to show our reflections as we stepped out of the attic. I imagined him racing into the hallway, his Mr. Smith face hanging down around his chin, ready to turn us into a pair of puddles on the floor-or whatever a person from his planet did to kids he caught snooping in his attic.

The screeching music continued.

Still moving slowly, Peter closed the door behind us. That seemed like a waste of time, until I realized he was afraid that if he didn't secure it, the door might swing open after he let go of it.

One noise like that and we were dead meat.

Dropping to our hands and knees, we crawled along the edge of the wall. I couldn't help it-when I was opposite the door of Broxholm's room, I glanced in. Broxholm was sitting there, peeling off his face. I prayed that he wouldn't see me, and crept forward.

We slid down the stairs, slipped out the front door, and ran for all we were worth. After about three blocks we stopped to catch our breath. But not for long. In addition to everything else, I was worried that since Broxholm was back my parents might be home, too.

But when we reached my house I could see that I had made it back first. That wasn't too surprising. My folks often stayed to gab with the other parents after the formal meeting was over. It was even possible that the meeting was still going on, and Broxholm had managed to slip out early.

Peter walked me to my door. I thought that was brave of him-especially when I watched him walk off into the darkness and realized how frightened I would be if I had to go home alone. That skinny kid had more courage than anyone I knew.

As for me, I was terrified. I went around and turned on every light in the house. (Don't ask me what good I thought that would do. All I know is it made me feel better.) Then I sat in the living room, waiting for my parents to come home and worrying that Broxholm might show up first.

All in all, I decided it had been a good night's work. Even if I hadn't found anything to prove my story, at least one other person now knew what was going on. Even more important, we had found Ms. Schwartz.

But what should we do now?

The crucial thing was to reveal Broxholm for what he really was. But how could we do that without getting turned into puddles on the floor? Our only advantage was that he didn't know we knew his secret. If we could make whatever we did seem innocent, he might not guess what we were up to.

Of course, the most obvious thing was just to pull off his mask.

But how do you pull a mask off an alien's face?

I spent the whole night trying to find the courage to do what I knew I had to do the next day.

Mr. Bamwick had scheduled me for an extra lesson that morning. As usual, Smith/Broxholm shuddered when he saw me pick up my piccolo. Let him shudder! If he kidnapped me, maybe I'd play the piccolo all the way to the next galaxy.

The reason for the extra lesson was that Bam-Boom wanted me to work on a solo he had asked me to play for the spring concert. We were doing the greatest march of all time, "The Stars and Stripes Forever" by John Philip Sousa. (If you don't know it, you should go to your library and get a record of it so you can listen to it. It's great.) Anyway, the highpoint of the march is this incredibly neat, incredibly difficult piccolo solo.

Mr. Bamwick had told me way back in February that he had wanted our band to do this march for seven years. He said he had just been waiting until he had a piccolo player good enough to handle the solo, and now he thought he had one. Me.

I was flattered that he had so much faith in me. The problem was, I didn't have that much faith in me. Oh, I could do most of the solo right-most of the time. But there was one trill near the end that I always messed up. Let me tell you, if you're going to play something in concert you don't want to get it almost right. You want it perfect.

But Mr. Bamwick was determined we would play "The Stars and Stripes Forever" that spring, or die trying. The way my lesson was going that Friday, it looked as if we were going to die.

"Come on, Susan," said Mr. Bamwick after I messed up for the third time. "The concert is next week! Did you practice last night?"

I shook my head. "I didn't have time," I said.

I knew it sounded pretty lame. But how could I tell him I hadn't practiced because I had been prowling through my teacher's house, trying to find evidence to prove he was an alien?

I could see Mr. Bamwick trying to control himself. I have to give him credit. He knows that it doesn't do any good to make a kid feel stupid. But I could tell he really wanted to explode. By the time I left his room, I was pretty upset myself.

That wasn't all bad. Being angry gave me the strength to do what I knew I had to do. Taking a deep breath, I marched back to my room. I paused outside the door and took another deep breath.

Then I went through the door, staggered over to Mr. Smith's desk, and pretended to faint.

On the way down, I grabbed for his ear.

CHAPTER ELEVEN.

Parent Conference Failure! I had hoped to hit the floor with Mr. Smith's face in my hand and Broxholm's real mug exposed for all the world to see. Instead, I ended up with a handful of air and a b.u.mp on the head.

The other kids in the cla.s.s shouted and jumped to their feet. Smith/Broxholm waved them away. He told Mike Foran to go get the nurse. Then he knelt over me to see if I was all right. He was acting so tender and concerned that I almost felt bad about trying to pull off his face. But all I had to do was think of Ms. Schwartz trapped in that force field in his attic, and any guilt I might have felt just floated right away.

"Susan! Susan, are you all right?" he asked, fanning my face.

I moaned and fluttered my eyes. "What-what happened?" I asked.

"You fainted," said Broxholm. He patted the side of his head. "Almost took my ear with you," he added. He gave me a cute little smile that showed the dimple in his right cheek.

Between the two of us, the air was thick with fake innocence. Was it really possible he didn't know what I was up to?

A minute later Mike came running back with Mrs. Glacka puffing along behind him. She checked my pulse, felt my forehead, and then helped me to her office to (surprise!) lie down.

She also decided to call my mother. This meant that I had to go home, and then to the doctor's, and then spend the rest of the afternoon in bed with my mother fussing and worrying about whether or not I was about to get my first period.

She even decided that I had to spend the evening in bed, too, after she brought my supper to my room.

"Gracious, Susan," she said when she burst through the door. "This place looks like an explosion at a garage sale. Can't you keep it a little neater?"

"I was planning to clean it today," I said. "Only I didn't feel up to it after I fainted."

"Poor baby," she said, setting the tray on my nightstand.

She seemed so pleased I decided not to tell her I had been kidding. She never could understand that I liked my room the way it was.

After supper I slipped out of bed and went to see my father.

He was sitting in his den, building a model of the Empire State Building out of toothpicks. That's his hobby-making famous buildings with toothpicks. If you ask me, it's pretty weird. But it keeps him happy, which is more than I can say for most adults I know. So I guess I shouldn't complain.

"Hi, Pook," he said when I walked in. "Feeling better?"

I nodded, not wanting to tell him I hadn't been feeling bad to begin with. I sat down next to him and started handing him toothpicks.

"So, what's on your pre-p.u.b.escent mind tonight?" he said holding up a toothpick and dabbing a bit of glue onto the end of it.

"Dad!" I said. But that was all I could think of. I tried, but I just couldn't bring myself to explain the situation. After a full minute of silence he turned to me and said, "Are you all right, Susan?" I knew he was really concerned, because he let the glue on the end of his toothpick dry out while he was waiting for my answer.

"I'm fine," I said at last. "Well, not exactly fine. I've got a problem."

"What kind of problem?" he asked. He put down his toothpick and gave me his full attention.

This was terrible! Can you imagine trying to tell your father that your teacher is an alien? He was going to think I was out of my mind.

But I had to do something. So I took a deep breath and said, "It's about Mr. Smith."

He nodded, inviting me to continue.

Look, I tried. I really did. But I just couldn't bring myself to say the words, "My teacher is an alien."

After a long, uncomfortable silence I finally said, "I don't think he likes me very much."

Dad looked appropriately worried. "Why not?" he asked.

"Well, he shudders whenever he sees me go to my music lesson." I hoped that might sound weird enough to get him to ask another question.

Come on, Dad, help me! I thought. Ask the right questions.

But he just laughed. "As long as Mr. Smith doesn't actually say anything, I don't think you can complain too much," he said. "Maybe the guy just doesn't like music. Not everyone can be as cultured as we are, you know. He's probably just a philistine."

Yeah, I thought, A Philistine-from the planet Philis!

But all I said aloud was, "Yeah. A Philistine."

Figuring he had solved my problem, Dad turned back to his toothpicks. "I wouldn't let it get to you, honey," he said. "The school year's almost over. You can tough it out till then. Now, you better scoot back to bed before your mother catches you out here."

I gave him a hug and trudged back to my room.

Now what? If I was going to do anything about this mess, I had to get some proof, and fast.

I was still trying to figure that all out when Peter called.

"Nice try today," he said. "You're really brave. I just hope Broxholm didn't figure out what you were up to."

Great! That was the last thing in the world I wanted to think about.

"I wasn't brave," I said. "Just desperate. What I want to know is what are we going to do next? We've got to find some way to prove the truth about Broxholm."

"Actually, that's why I'm calling," said Peter. "I wanted to know if you had a camera."

"Sure. Why?"

He hesitated, then said, "Well, are you game for another expedition into Broxholm's lair?"

I smiled for the first time that day. "So we can take a picture of Ms. Schwartz! Peter, you're brilliant. Only when can we be sure he won't be there?"

"How about during school?"

"Peter, I can't skip school! My mother would kill me!"

"Would you rather get kidnapped by aliens?" he asked I sighed. "All right. I'll bring my camera to school on Monday. We'll talk about it then."

I hung up and tried not to think about the fact that in two days, I was going to go back into the alien's den.

In fact, I spent most of that whole long, sleepless night trying not to think about it.

CHAPTER TWELVE.

Things Get Weirder I didn't think it was all that weird when Stacy Benoit called me Sat.u.r.day morning to see how I was doing. After all, she's my friend, and she did think I had fainted in school the day before. I didn't realize when I laughed and told her there wasn't anything wrong with me that I was only confirming her worst fears.

I didn't figure that out until Monday morning, when our cla.s.s turned into something from the Twilight Zone.

Until that point, I had other things to worry about-like what to do about Ms. Schwartz.

Since my mother still wouldn't let me out of the house, I spent a long time discussing this force field thing with Peter over the phone. He told me he was pretty sure Ms. Schwartz was actually safer inside that thing than she would be walking the streets.

"She probably doesn't like it in there," he said. "I know I wouldn't. But nothing's going to hurt her."

"Well, doesn't she have to eat or go to the bathroom, or something?" I asked nervously.

I could almost see Peter's shrug over the telephone line. "I don't think so," he said. "I have a feeling time is pretty much holding still inside that thing. So unless she had to go to the bathroom when he put her in there, she's probably fine." He paused, then added, "Come to think of it, that force field could be a woman's dream-she won't age a bit!"

"Don't be a male chauvinist piglet," I said angrily. "This is serious."

"I know it's serious," snapped Peter. "But we can't do anything about it this weekend-unless you know of a time when we can be sure that Broxholm won't be there."

"I suppose you're right," I said.

But the thought of Ms. Schwartz trapped in that force field gnawed away at me for all the rest of the day and all of Sunday, too. I had to get her out of there!

I was still stewing about that on Monday, until things got so weird that I forgot about Ms. Schwartz for a while.

It started with Duncan Dougal, who walked into cla.s.s carrying the biggest apple I had ever seen in my life.

"Good morning, Mr. Smith," he said. "How are you today?" His voice was so syrupy-sweet it made me want to throw up.