When reporter Rebecca Connolly gets a tip that suspected murderer Roddie Drummond will be returning to the island of Stoirm, she smells a story. Though never convicted in the death of his girlfriend Mhairi fifteen years earlier, Drummond is still guilty in the eyes of many islanders, and his return for his mother’s funeral is sure to stir up old resentments, hatreds, possibly even violence. Rebecca has another reason for going to Stoirm. Her own father came from there, but he never went back, and he always refused to speak of it or say what drove him away.

Defying her editor, Rebecca joins forces with local photographer Chazz Wymark to dig into the mystery surrounding Mhairi's death and her unexplained last words, “Thunder Bay”—the secluded spot on the west coast of the island where, according to local lore, the souls of the dead set off into the afterlife. When a string of violent events erupts across the island, Rebecca discovers the power of secrets, and she must decide what to bury, and what to bring into the light.