"The Keeper of Lost Causes" is a crime novel by Jussi Adler-Olsen, featuring the character Carl Mørck, a detective in the Copenhagen Police. After a traumatic incident, Mørck is assigned to the cold cases department, where he investigates unresolved cases that have been abandoned. The story revolves around the mysterious disappearance of Merete Lynggaard, a politician who vanished five years earlier. As Mørck delves into the case, he uncovers dark secrets and faces dangerous adversaries, highlighting themes of justice and redemption in a gripping narrative.