They waded slowly into the water. The current carried them rapidly along. Side by side, with slow, careful strokes, they swam, keeping close to shore. The river was shallow--hardly over their heads. The water was cold and, Mercer thought, curiously buoyant. It seemed hardly more than a moment before the shadowy black figure of outlines of the boat loomed ahead. They could make out the figure of its single occupant, sitting with his arm on the gunwale. They swam hardly at all now, letting the current carry them forward. As silent as two drifting logs they dropped down upon the boat and in another moment were clinging to a bit of rope that chanced to be hanging over its stern. The bow of the boat was nosed against the bank; it lay diagonally downstream, with its stern some twenty feet from shore. Its occupant was sitting amidships, facing the bow. Mercer drew himself up until his eyes were above the stern of the boat and saw him plainly. He was slouching down as though dozing. His elbow was crooked, carelessly over the gunwale. Mercer's heart gave an exultant leap as he saw a little cylinder in the man's hand. There was a little projection on the boat at the water line, and, working along this with his hands, Mercer edged slowly toward the man. He knew he could not be heard, for the murmur of the water slipping past the sides of the boat drowned the slight noise he made. He edged his way along, with not much more than his face out of water, until he was directly beneath the motionless form in the boat. Mercer's heart was beating so it seemed to smother him. Slowly he pulled himself up until the fingers of his left hand gripped the gunwale hardly more than a foot or two behind the man's back. His other hand reached forward. He must have made a slight noise, for the man sat suddenly upright, listening. Mercer's right hand shot out. His fingers closed over the little cylinder and the hand holding it. He bent it inward, twisting the man's wrist. His thumb fumbled for the little button Anina had described. There was a tiny puff of light; the man's body wavered, then fell forward inert. Mercer climbed into the boat. He looked back. Anina was pulling herself up over the stern. A long pole lay across the seats. He picked it up and started with it toward the bow. And then he tripped over something and fell headlong, dropping the pole with a clatter. As he picked himself up there came a shout from the men in the woods. Mercer hurried forward and cast off the rope that held the boat to the bank. It had been tied more or less permanently at this end. As he fumbled at the knots he heard Anina's soft, anxious voice calling: "Hurry, Ollie, hurry!" The shouts from the woods continued. The knots loosened finally. The boat slid back away from the bank; with the pole Mercer shoved the bow around. An instant later Anina had started the mechanism, and in a broad curve they swung silently out into the river.