The snake-devil spat out the spear and tried to raise its head. But the muscles were already weakening. It fought the poison long enough to take a single step forward, its small red eyes alight with brainless hate. Then it crashed and lay twisting. Dalgard lowered his bow. There was no need for a second shot.

Sssuri regarded the remains of his spear unhappily. Not only was it the product of long hours of work, but no merman ever felt fully equipped to face the world without such a weapon to hand. He salvaged the barbed head and broke it free of the shred of haft the snake-devil had left. Knotting it at his belt he turned to Dalgard.

"Shall we see what lies beyond?"

Dalgard crossed the hall to test the door. It did not yield to an inward push, but rolled far enough into the wall to allow them through.

On the other side was a room which amazed the scout. The colonists had their laboratory, their workshops, in which they experimented and tried to preserve the remnants of knowledge their forefathers had brought across space, as well as to discover new. But the extent of this storehouse with its bewildering mass of odd machines, tanks, bales, and stocked shelves and tables, was too much to be taken in without a careful and minute examination.

"We are not the first to walk here." Sssuri had given little attention to what was stacked about him. Instead he bent over the disturbed dust in one aisle. Dalgard noted as he went to join the merman that there were gaps on those tables which ran the full length of the room, lines left in the grimy deposit of years which told of things recently moved. And then he saw what had interested Sssuri: tracks, some resembling those which his own bare feet might leave, except that there were only three toes!

"They."

Dalgard who had been a hunter and a tracker before he was an explorer crouched for a clearer view. Yes, they were recent, yet not made today or even yesterday; there was a thin film of dust resettled in each.

"Some days ago. They are not in the city now," the merman declared with certainty. "But they will come again."

"How do you know that?"