The black specks became larger, forming themselves into swift one-man fliers. The three men pelted across the graded conveyors as hard as they could run. No Earthman tried to stop them; one look at their grim faces would have been a most potent dissuader. And fortunately there were no Mercutians within hailing distance other than the rapidly nearing fliers.

They flung themselves off the last slow-moving platform, panting.

"Which way now?" Hilary asked. His quick eye raked the scene for possible hideouts. They were on a smoothly clipped lawn, heaving gently up to a pretty rambling structure, built on an antique design, pleasingly irregular and nestling to the ground as though it were indigenous to the soil. The walls were modern, though, of vita-crystal, which possessed the peculiar property of permitting _all_ of the beneficial rays of the sun to penetrate, and yet presented a perfectly opaque appearance to the outside world.

No other hiding place was in sight. The lawn stretched smooth on all sides except for a scattering of trees--poor enough cover. The Mercutians were almost directly overhead now, preparing to swoop.

"Our only chance seems to be the house," Hilary answered his own question quietly.

Grim shook his head. "Their search beams can penetrate the vita-crystal walls as though they were transparent gla.s.s."

Hilary's heart sank. "Can't help it," he said laconically. "Come on."

The three men broke into a run. It was only a hundred yards, but the Mercutians were coming down fast. They had been seen. A flash as of molten metal gleamed overhead. A blinding ray leaped for the ground, struck viciously a little ahead of the running men. The velvet green gra.s.s crisped to ash; the soil underneath scorched.

"Scatter!" Hilary shouted.

Instantly the men spread out. Another blast hissed down at them, so close to Hilary that the heat seared his left side like a red-hot iron. The Mercutians were getting the range. Wat Tyler stopped short with a howl of defiance. He whipped the hand tube he had taken from the dead guard out of his blouse.

"Hide it, you fool!" Hilary yelled back at him. "We don't want them to known we are armed."

Wat obeyed reluctantly. He shook his fist high in the air, and started to run again. It was not an instant too soon, either. A beam slithered down the smoldering air, and the Earth literally boiled under its impact, directly on the spot where Wat had stopped to shake his fist.

All about them the terrible rays were slashing now.

But a last desperate burst of speed carried the Earthmen onto a wide enclosed portico, in the old manner. Hilary pounded on the vita-crystal door. It was tightly locked.

"Step back a moment," Morgan rumbled.

Hilary obeyed. The big man spat thoughtfully upon his hands, worked his shoulders tentatively. Then he too retreated to the outermost edge of the portico. Above, the crystal suddenly shattered. Sharp-edged fragments showered down upon them. There was little time to waste.

Grim heaved forward in a slanting rush, right shoulder extended. He crashed into the locked door like a runaway train. There was a grinding noise, a smash of crystal, and his shoulder was through, incased in a halo of bright, sharp edges.

The big man staggered back, his shoulder streaming blood from a hundred cuts. His face was pale and drawn.

"Good fellow," Wat yelled, "even though you are an overgrown ox." He darted in behind the man-mountain like a twisting snake. His deft fingers reached in through the shattered crystal, pressed something on the inside. The door slid into its wall pocket with a sound of grinding gla.s.s.

Wat burst into the opened room first, Grim right behind him. Hilary brought up the rear, Grim's great bulk blotting out for the moment any view of the interior.

There was a sudden gasp--a girl's voice.

"Wh--What does this mean?" She was tremulous, yet unafraid.

Hilary stopped suddenly as though brought up against a solid wall. His heart pounded madly. That voice--but it was utterly impossible!

Wat answered, gallantly. "Sorry to annoy you, miss, but they're after us. My partner here's wounded."

"Oh, you poor man." There was quick sympathy in the clear tones. "But who is after you?"

A splintering crash resounded outside.

"The Mercutians, as you no doubt hear," the little man responded with faint irony.

The girl gasped again. "Oh my G.o.d!"

There was silence. Hilary strained his ears, yet took care to keep hidden behind Grim's huge frame. What would she do now? It seemed to him as if the whole world depended on her reply.

The girl broke the silence. She had come to a swift decision.

"They must not get you. Go upstairs, quietly, into the chamber on the left of the hall. It's my bedroom. Their search beams can not penetrate it; the walls are draped with lead-encrusted curtains. I'll stay down here and try to throw them off the trail."

Hilary's heart recommenced beating. A gush of joy overwhelmed him.

The girl had proven herself.

Grim spoke, for the first time.

"You know the penalty of course, for hiding us."

She did not answer directly. "I can't help it. I can't surrender Earthmen to those beasts. Besides"--there was a catch in her voice--"it does not matter much since--"

Hilary stepped quietly from behind Grim's overshadowing bulk.

The girl's eyes went wide at the sight of him; her slender white hand flew to her throat. She looked as if she had seen a ghost.

"You--you!" she choked. "Hilary!"

She swayed and would have fallen, had Hilary not jumped to catch her.

His heart was beating thickly with excess of emotion. Joan Robbins in his arms again--how he prayed for this moment in the icy reaches of interplanetary s.p.a.ce. Yet what was she doing here in Bronxville? Her home had always been atop the windswept Robbins Building in Great New York.

Her hand went softly over his features, as though to a.s.sure herself that it was really he.

"Oh, my dear," she whispered brokenly. "I had almost given up all hope. Everyone was certain you were lost--long ago."

Whirrings sounded outside.

"Sorry to break up your reunion," Grim interrupted in his ba.s.s rumble, "but the Mercutians have landed on the lawn. They'll be in here right away."

Joan tore herself out of Hilary's arms. Her slim straight figure tautened; her velvet soft eyebrows puckered over deep-lit pools.

"Upstairs quickly, all of you," she cried. "I'll manage them somehow."

Hilary said quietly, "I won't leave you alone with those brutes. You go along up, and I'll remain here." The automatic gleamed in his hand.