What would you do if a killer lived next door? Before She Knew Him by Peter Swanson is a spine-tingling tale of Hen and her husband, Lloyd, who have settled into their new house outside of Boston. Hen is an illustrator who's finally found the right medicine to control bipolar disorder, and everything is calm at home until they meet the next-door neighbours. She spots a familiar object on the husband's office shelf — the sports trophy that looks like one that went missing from a man who was killed years ago. She is trying to move past her obsession with the case, but she worries that her neighbour is a serial killer. She doesn't know who to trust…and nobody seems to believe her.