The "Detective Harry Hole Series" is a collection of crime novels written by Norwegian author Jo Nesbø. The series follows the character Harry Hole, a skilled but troubled detective in the Oslo Police Department. Known for his unconventional methods and personal struggles, Hole tackles complex cases that often delve into the darker aspects of human nature. The series includes several titles, with each book presenting a new mystery for Hole to solve. Themes of addiction, morality, and the impact of the past are prevalent throughout the series, making it both a gripping and thought-provoking read for fans of the crime genre.