The Murder Room

This is another fantastic Adam Dagliesh mystery by PD James. In this novel set in England, there's the Dupayne Museum which has a Murder Room--a room which showcased actual unsolved murders in that room from England's past, which an attached history to it. It's owned and managed by two brothers and a sister, who are fighting for it's closure or staying open. Suddenly, there's a copycat killer who have killed somebody outside of the room, and later, inside the room. It's up to Adam Dagliesh and his team to figure out who's the killer before someone else is next. When there's a third victim, they start to add up the pieces, one by one, to find out who's the killer. Plus, Adam's relationship with Emma is tested, when they're at a crossroads. A fantastic read.