CERTAIN SIGNS THAT YOU ARE DEAD is the fourth psychological thriller in Torkil Damhaug's Oslo Crime Files, a tense and dark quartet for fans of Camilla Lackberg and Jo Nesbo.Every killer leaves a trace.In Akershus University Hospital, a patient disappears into thin air.That evening, his body is found in a basement box-room, his throat cut.When retired forensic pathologist Jennifer Plåterud is called in to examine the dead man, she has no idea of just how closely she is involv