Northumberland, 1838. The TARDIS crash lands on board a sinking steamship. Stranded, the Doctor and the few survivors fight for their lives - while the local lighthouse keeper's daughter, Grace Darling, risks her life to row to their rescue. Lauded a heroine, Grace struggles to cope with her new-found fame. But the Doctor senses something else is troubling Grace. She's been tormented by the terrifying vision she saw out at sea in the storm. There's a monster in her mind, wrecking ships and stealing the souls of the drowned. And it's real.