When a woman offers a brass comb for a late crossing, Tomas Rolle expects an awkward customer. Instead, his water taxi reaches a vanished landing—and the tide follows him home.

A widower wants one more evening with his wife. A child waits for a brother who never came back. The dead ferry steward knows why these passengers have found Tomas, but the answer lies in a careless piece of salvage he would rather not explain. Each fare opens the crossing wider, drawing water through the island's streets as a spring tide approaches.

Across eight connected episodes, The Water Between follows Tomas, his sister Selene and his young assistant Dev towards a final return to the wreck. The season resolves the haunting and its central mystery, while leaving the survivors to face the ordinary damage that remains.