The series "Mörkt Hjärta" is a Danish-Swedish crime thriller about a person's disappearance. In a small town in the north, a wealthy and influential landowner goes missing without a trace. The millionaire has a daughter who becomes one of the main suspects. It is known that the girl was secretly seeing a mysterious farmer boy whom her wealthy father despised. Tanya Torrell, the head of the local search and rescue service, takes on the case, but she has an unexpected theory.