A brash but brilliant cop becomes head of a new police department, where he leads an unlikely team of misfits in solving Edinburgh's cold cases. Dept. Q is a British crime thriller television series created by Scott Frank and Chandni Lakhani, based on the book series by Danish writer Jussi Adler-Olsen. It premiered on Netflix on 29 May 2025.[1] In August 2025, it was renewed for a second season.[2]