"I couldn't do anything suspicious," she answered. "But I figured you hadn't leaped off the cliff in sheer desperation. You must have had some hiding place in mind and under water seemed the most probable. In view of what you'd already done I was pretty sure you could hold your breath abnormally long." Her smile was a little shaky. "Though I didn't think it would be _inhumanly_ long." "You've got brains," he said, "but how much heart?" "What do you mean?" "I mean, are you going to throw Dr. Tighe and me to the wolves now? Or will you help us?" "That depends," she answered slowly. "What are you here for?" His mouth twisted ruefully. "I'm not here on purpose at all," Dalgetty confessed. "I was just trying to get a clue to Dr. Tighe's whereabouts. They outsmarted me and brought me here. Now I _have_ to rescue him." His eyes held hers. "Kidnapping is a Federal offense. It's your duty to help me." "I may have higher duties," she countered. Leaning forward, tautly, "But how do you expect to do this?" "I'm damned if I know." Dalgetty locked moodily out at the beach and the waves and the smoking spindrift. "But that gun of yours would be a big help." She stood for a moment, scowling with thought. "If I don't come back soon they'll be out hunting for me." "We've got to find another hiding place," he agreed. "Then they will assume I survived after all and grabbed you. They'll be scouring the whole island for us. If we haven't been located before dark they'll be spread thin enough to give us a chance." "It makes more sense for me to go back now," she said. "Then I can be on the inside to help you." He shook his head. "Uh-uh. Quit making like a stereoshow detective. If you leave me your gun, claiming you lost it, that's sure to bring suspicion on you the way they're excited right now. If you don't I'll still be on the outside and unarmed--and what could you do, one woman alone in that nest? Now we're two with a shooting iron between us. I think that's a better bet." After a while, she nodded. "Okay, you win. Assuming"--the half-lowered gun was raised again with a jerking motion--"that I will aid you. Who are you? _What_ are you, Dalgetty?" He shrugged. "Let's say I'm Dr. Tighe's assistant and have some unusual powers. You know the Institute well enough to realize this isn't just a feud between two gangster groups." "I wonder...." Suddenly she clanked the automatic back into its holster. "All right. For the time being only though!" Relief was a wave rushing through him. "Thank you," he whispered. Then, "Where can we go?" "I've been swimming around here in the quieter spots," she said. "I know a place. Wait here." She stepped across the cave and peered out its mouth. Someone must have hailed her, for she waved back. She stood leaning against the rock and Dalgetty saw how the sea-spray gleamed in her hair. After a long five minutes she turned to him again.