Stigma

Stigma is the fourth book in the Blix and Ramm series.
A German killer, Walter Kroos, escapes from prison, and may be making his way to Norway.
Blix, who is in prison, tries to engage with a fellow convict who may have a connection with Walter Kroos.
Emma Ramm, meanwhile, visits the campsite in Norway where Walter Kroos once holidayed with his parents, and learns of an incident which occurred during their stay.
Stigma is a tense, gripping read that pulls you in from the very first page.