He was half way through it when he saw the bow of a dory sliding into view past the rocks at the end of the cove. Jumping back like a flash, he jerked the door shut and latched it noiselessly. For an instant he hesitated, heart pounding in his throat. Then he moved swiftly to the window, pulled himself up, squeezed through and plunged into the fringe of undergrowth about a dozen feet away.