Trainees in the FBI's psychological profiling program must put their training into practice when they discover a killer in their midst. Based very loosely on Agatha Christie's And Then There Were None.
After losing sight of each other for 25 years, the paths of three childhood friends cross paths. It concerns successful conductor Victor Slingeland, successful writer Sander Vastenhout and general practitioner Bert Duprez. Slingeland enjoys a reputation as a womanizer. This intrigues Vastenhout who, as is often the case with authors, is without inspiration. Vastenhout sees the unraveling of Slingeland's complex personality as possible new material for a novel. With the help of Dr. Duprez, Vastenhout tries to find out about Slingeland's secret by imitating his behavior and thus challenging him.
History teacher Jurre and public prosecutor Sarah each battle the criminal world in their own way. Although the two have been married for years, they keep their double life a secret from each other in order to protect each other and their family. The situation is getting more and more dangerous and their children are no longer safe either.