In 1969, seventeen-year-old Kathy Sartori is brutally attacked, her body hurled into Brooklyn's Sheepshead Bay. Miraculously, she survives, fights her way back to the surface, only to discover that fifty years have passed, and an eerie doppelganger has lived out an entire life in her place. Kathy soon confronts not just this strange double, but the madman who ''murdered'' her five decades earlier.