"Those two men have shrunk away behind some mast or other," cried Knapp. "They are the fellows he's after. But what can they have to do with the murder? Have you ever seen them here about town, Dr. Talbot?"

"Not that I remember; they have a foreign air about them. Look like
South Americans."

"Well, they're going to South America. Sweetwater can't stop them. He has barely time to get off the ship himself. There goes the last rope! Have they forgotten him? They're drawing up the ladder."

"No: the mate stops them; see, he's calling the fellow. I can hear his voice, can't you? Sweetwater's game is up. He'll have to leave in a hurry. What's the rumpus now?"

"Nothing, only they've scattered to look for him; the fox is down in the cabins and won't come up, laughing in his sleeve, no doubt, at keeping the vessel waiting while he hunts up his witness."

"If it's one of those two men he's laying a trap for he won't snare him in a hurry. They're sneaks, those two, and—Why, the sailors are coming back shaking their heads. I can almost hear from here the captain's oaths."

"And such a favourable wind for getting out of the harbour! Sweetwater, my boy, you are distinguishing yourself. If your witness don't pan out well you won't hear the last of this in a hurry."

"It looks as if they meant to sail without waiting to put him ashore," observed Frederick in a low tone, too carefully modulated not to strike his father as unnatural.

"By jingoes, so it does!" ejaculated Knapp. "There go the sails! The pilot's hand is on the wheel, and Dr. Talbot, are you going to let your cunning amateur detective and his important witness slip away from you like this?"

"I cannot help myself," said the coroner, a little dazed himself at this unexpected chance. "My voice wouldn't reach them from this place; besides they wouldn't heed me if it did. The ship is already under way and we won't see Sweetwater again till the pilot's boat comes back."