Three-thirty in the morning...To Ray Garraty it seemed the longest minute of the longest night of his entire life. It was low tide, dead ebb, the time when the sea washes back, leaving slick mudflats covered with straggled weed, rusty beer cans, rotted prophylactics, broken bottles, smashed buoys, and green-mossed skeletons in tattered bathing trunks. It was dead ebb.