The Fourth Man - K. O. Dahl's hard-boiled psychological crime thriller, set in Oslo - is a tale of revenge and erotic obsession.

In the course of a routine police raid Detective Inspector Frank Frølich of the Oslo Police saves Elizabeth Faremo from getting inadvertently caught in crossfire. By the time he learns that she is the sister of Jonny Faremo, wanted member of a larceny gang, it is already too late, he is obsessed.

Suspected, suspended, and blindly in love, Frølich must find out if he is being used before his life unravels beyond repair.