When a storm smashes into Truman Harbor, Major Cass Morgan expects salvage and salt. What she finds is a dead diver, a silver coin with a coal-red heart, and a ship that should not exist - then vanishes in thirteen lightning flashes. As objects across Key West begin to hum in the same sinister rhythm, time itself starts to fray: people age and reverse, cameras lag, and a lighthouse counts its light in a dangerous, repeating code.Cass and Dr. Gabe Reyes race to unravel a knot that links a cursed coin, an astrolabe, an iron anchor, and a rapier - and to build a trap of copper and batteries before the pull snaps the island apart. This is a story of stubborn people in impossible weather, of artifacts that remember wrong centuries, and of a single, terrible cadence that wants everything it touches to obey its count.Pulse-driven supernatural thriller set on a rain-sliced harbor and a stuttering island.A procedural lead who trusts facts more than folklore - until the facts change.High-stakes engineering meets folklore: coils, cages, and a plan to "unwind" time.Atmosphere-packed: lighthouses, museums, reef night, and a storm that keeps time.Dark currents, old iron, and thirteen stubborn flashes. If you like tense, maritime supernatural thrillers with science-minded heroes and a relentless sense of dread, Thirteen Knots will pull you under.