When reporter Rebecca Connolly is told of Roddie Drummond's return to the island of Stoirm she senses a story. Fifteen years before he was charged with the murder of his lover, Mhairi. When he was found Not Proven, Roddie left the island. Now he has returned for his mother's funeral and it will spark an explosion of violence. Rebecca joins forces with local photographer Chaz Wymark to dig into the secrets surrounding Mhairi's death, and her mysterious last words of Thunder Bay, where, according to local lore, the souls of the dead set off into the afterlife. When another murder takes place, she is ideally placed to uncover the truth about what happened that night 15 years before.