When a violent murder shatters the otherwise peaceful idyll of Andaby near Hebden Bridge, can't help but suspect that her brother Ewan - recently released from prison and now living in Calderdale - is behind it. Ewan claims he's innocent, and even has an alibi to prove it, but DS Banks isn't convinced. So much so that she turns to the only people who can help her in an investigation this personal: and Grace Edwards, of Hartley and Edwards Investigations. On the hunt for the killer, Kitt and Grace discover the victim was choked to death on her old school sash. From this lead, Kitt, Grace and DS Banks are drawn down a dark trail littered with decade-old grudges, schoolyard secrets, broken hearts and bullies, and struggle to get closer to the truth. When a second victim goes missing however, the clock starts ticking.