Welibus hesitated a fraction of a second, then turned his back, lifted the flap of his mask. Thissell saw heavy black ringlets. “Does that answer your question?” inquired Welibus.

“Completely,” said Thissell. He crossed the esplanade, went out on the dock to Kershaul’s houseboat. Kershaul greeted him without enthusiasm, and invited him aboard with a resigned wave, of the hand.

“A question I’d like to ask,” said Thissell; “what color is your hair?”

Kershaul laughed woefully. “What little remains is black. Why do you ask?”

“Curiosity.”

“Come, come,” said Kershaul with an unaccustomed bluffness. “There’s more to it than that.”

Thissell, feeling the need of counsel, admitted as much. “Here’s the situation. A dead out-worlder was found in the harbor this morning. His hair was brown. I’m not entirely certain, but the chances are — let me see, yes — two out of three that Angmark’s hair is black.”

Kershaul pulled at the Cave Owl’s goatee. “How do you arrive at that probability?”

“The information came to me through Rolver’s hands. He has blond hair. If Angmark has assumed Rolver’s identity, he would naturally alter the information which came to me this morning. Both you and Welibus admit to black hair.”

“Hm,” said Kershaul. “Let me see if I follow your line of reasoning. You feel that Haxo Angmark has killed either Rolver, Welibus or myself and assumed the dead man’s identity. Right?”

Thissell looked at him in surprise. “You yourself emphasized that Angmark could not set up another out-world establishment without revealing himself! Don’t you remember?”

“Oh, certainly. To continue. Rolver delivered a message to you stating that Angmark was dark, and announced himself to be blond.”

“Yes. Can you verify this? I mean for the old Rolver?”

“No,” said Kershaul sadly. “I’ve seen neither Rolver nor Welibus without their masks.”

“If Rolver is not Angmark,” Thissell mused, “if Angmark indeed has black hair, then both you and Welibus come under suspicion.”

“Very interesting,” said Kershaul. He examined Thissell warily. “For that matter, you yourself might be Angmark. What color is your hair?”

“Brown,” said Thissell curtly. He lifted the gray fur of the Moon Moth mask at the back of his head.

“But you might be deceiving me as to the text of the message,” Kershaul put forward.

“I’m not,” said Thissell wearily. “You can check with Rolver if you care to.”

Kershaul shook his head. “Unnecessary. I believe you. But another matter: what of voice? You’ve heard all of us before and after Angmark arrived. Isn’t there some indication there?”

“No. I’m so alert for any evidence of change that you all sound rather different. And the masks muffle your voices.”

Kershaul tugged the goatee. “I don’t see any immediate solution to the problem.” He chuckled. “In any event, need there be? Before Angmark’s advent, there were Rolver, Welibus, Kershaul and Thissell. Now — for all practical purposes — there are still Rolver, Welibus, Kershaul and Thissell. Who is to say that the new member may not be an improvement upon the old?”

“An interesting thought,” agreed Thissell, “but it so happens that I have a personal interest in identifying Angmark. My career is at stake.”

“I see,” murmured Kershaul. “The situation then becomes an issue between yourself and Angmark.”

“You won’t help me?”

“Not actively. I’ve become pervaded with Sirenese individualism. I think you’ll find that Rolver and Welibus will respond similarly.” He sighed. “All of us have been here too long.”

Thissell stood deep in thought. Kershaul waited patiently a moment, then said, “Do you have any further questions?”

“No,” said Thissell. “I have merely a favor to ask you.”

“I’ll oblige if I possibly can,” Kershaul replied courteously.

“Give me, or lend me, one of your slaves, for a week or two.”

Kershaul played an exclamation of amusement on the ganga. “I hardly like to part with my slaves; they know me and my ways — ”

“As soon as I catch Angmark you’ll have him back.”

“Very well,” said Kershaul. He rattled a summons on his hymerkin, and a slave appeared. “Anthony,” sang Kershaul, “you are to go with Ser Thissell and serve him for a short period.”

The slave bowed, without pleasure.

Thissell took Anthony to his houseboat, and questioned him at length, noting certain of the responses upon a chart. He then enjoined Anthony to say nothing of what had passed, and consigned him to the care of Toby and Rex. He gave further instructions to move the houseboat away from the dock and allow no one aboard until his return.

He set forth once more along the way to the landing field, and found Rolver at a lunch of spiced fish, shredded bark of the salad tree and a bowl of native currants. Rolver clapped an order on the hymerkin, and a slave set a place for Thissell. “And how are the investigations proceeding?”

“I’d hardly like to claim any progress,” said Thissell. “I assume that I can count on your help?”

Rolver laughed briefly. “You have my good wishes.”

“More concretely,” said Thissell, “I’d like to borrow a slave from you. Temporarily.”

Rolver paused in his eating. “Whatever for?”

“I’d rather not explain,” said Thissell. “But you can be sure that I make no idle request.”

Without graciousness Rolver summoned a slave and consigned him to Thissell’s service.

On the way back to his houseboat, Thissell stopped at Welibus’ office.

Welibus looked up from his work. “Good afternoon, Ser Thissell.”

Thissell came directly to the point. “Ser Welibus, will you lend me a slave for a few days?”

Welibus hesitated, then shrugged. “Why not?” He clacked his hymerkin; a slave appeared. “Is he satisfactory? Or would you prefer a young female?” He chuckled rather offensively, to Thissell’s way of thinking.

“He’ll do very well. I’ll return him in a few days.”

“No hurry.” Welibus made an easy gesture and returned to his work.

Thissell continued to his houseboat, where he separately interviewed each of his two new slaves and made notes upon his chart.

Dusk came soft over the Titanic Ocean. Toby and Rex sculled the houseboat away from the dock, out across the silken waters. Thissell sat on the deck listening to the sound of soft voices, the flutter and tinkle of musical instruments. Lights from the floating houseboats glowed yellow and wan watermelon-red. The shore was dark; the Night-men would presently come slinking to paw through refuse and stare jealously across the water.

In nine days the Buenaventura came past Sirene on its regular schedule; Thissell had his orders to return to Poly-polis. In nine days, could he locate Haxo Angmark?

Nine days weren’t too many, Thissell decided, but they might possibly be enough.

Two days passed, and three and four and five. Every day Thissell went ashore and at least once a day visited Rolver, Welibus and Kershaul.

Each reacted differently to his presence. Rolver was sardonic and irritable; Welibus formal and at least superficially affable; Kershaul mild and suave, but ostentatiously impersonal and detached in his conversation.

Thissell remained equally bland to Rolver’s dour jibes, Welibus’ jocundity, Kershaul’s withdrawal. And every day, returning to his houseboat he made marks on his chart.

The sixth, the seventh, the eighth day came and passed. Rolver, with rather brutal directness, inquired if Thissell wished to arrange for passage on the Buenaventura. Thissell considered, and said, “Yes, you had better reserve passage for one.”

“Back to the world of faces.” Rolver shuddered. “Faces! Everywhere pallid, fish-eyed faces. Mouths like pulp, noses knotted and punctured; flat, flabby faces. I don’t think I could stand it after living here. Luckily you haven’t become a real Sirenese.”

“But I won’t be going back,” said Thissell.