While recovering from a severe injury, Wisting receives an anonymous letter. The cryptic content leads Wisting to suspect a possible injustice in an old murder case where a 17-year-old girl was killed, and her ex-boyfriend was convicted.
Anonymous letter unearths new evidence in an old murder case, angering those wanting it closed. Wisting faces opposition within the police as he pursues the mystery sender.
A breakthrough leads Wisting and Interpol investigator Dunn to Vilnius for questioning a suspect, but it evolves into a complex situation professionally and personally.
New DNA evidence appears to solve the murder of Tone, but Wisting still feels that something is amiss. Wisting and his colleagues must call on all of their skills and experience to avoid a dramatic and dangerous situation.