"Karen Pirie" is a British television series based on the novels by author Val McDermid. The show follows the character Karen Pirie, a determined and skilled detective who works in the cold case unit of the police. She is known for her tenacity and ability to solve complex cases that have remained unsolved for years. The series features a mix of crime, mystery, and drama, showcasing Karen Pirie's investigative techniques and her interactions with various characters. It highlights themes of justice and the impact of unresolved crimes on victims' families, making it both engaging and thought-provoking for viewers.