A detective is drawn into a dangerous investigation that blurs the lines between past and present. Detective Inspector Karen Pirie is called to a remote Scottish island to investigate a cold case: the murder of a young woman twenty years prior. As Pirie delves into the victim's life and the secrets of the island community, she uncovers a web of deceit and betrayal that still has deadly consequences. The investigation is complicated by the isolation of the island and the reluctance of its inhabitants to speak about the past. The narrative unfolds through Pirie's present-day investigation and flashbacks to the events of twenty years ago.

Val McDermid's 'Xwire in Blood' is recognized for its intricate plotting and atmospheric setting, drawing readers into the dark secrets of a remote Scottish island. Critics often praise McDermid's ability to craft compelling characters and build suspense, making this a standout in the crime fiction genre. The novel is noted for its exploration of how past events continue to haunt the present, creating a palpable sense of unease. Readers frequently commend the novel's pacing and the satisfying resolution of its complex mystery.