Good thrillers often stand or fall by their initial concept. Think the missing wife and the diary of Gone Girl. Or the woman with amnesia and a journal in Before I Go To Sleep. A simple, possibly plausible, plot driver that is able to twist and flex as the circumstances change. In The Trap, that concept is the reclusive novelist, seeking revenge for the murder of her sister eleven years before.Because she cannot bring herself to leave her house, Linda addresses the issue of drawing out the man she believes responsible for her sister’s murder in the only way she knows how – she writes a book about it. To say too much about the plot of this short, muscular thriller would be to step well into spoiler territory. But the setup has Linda believing that it is a television journalist she saw on the night of her sister’s death and uses the offer of an interview to lure him into a situation in which she can question him. Sections from Linda’s novel pepper the narrative, giving a fictionalised version of the events surrounding her sister’s murder. Raabe uses two layers of unreliable narration to keep everything out of kilter….