When a stranger asks her to mind her bag on a train, Freya agrees without thinking. But when the train reaches the end of the line, Freya is left holding a laptop. She approaches private investigator Amy Lane to find the missing woman. As Amy tries to crack the encrypted computer, Jason searches for its owner on the streets of Cardiff, but with few leads. Until Freya turns up dead. Convinced Freya’s death is related, Amy ignores the warnings of the police and pursues her own murder investigation. What she finds is incredible.