Den fjärde mannen is a Swedish crime novel written by Håkan Nesser. The story follows the investigation of a murder case in the small town of Kymlinge. Detective Inspector Van Veeteren and his team are called in to solve the mystery, but they soon realize that the case is more complex than they initially thought.
As they delve deeper into the investigation, Van Veeteren and his team uncover a web of lies, deceit, and betrayal that leads them to suspect that there may be a fourth man involved in the murder. With time running out and the pressure mounting, they must race against the clock to catch the killer before he strikes again.
Den fjärde mannen is a gripping and suspenseful novel that will keep readers on the edge of their seats until the very end.