A gruff, unconventional detective inspector named Jack Frost operates in the fictional English town of Denton, tackling a variety of criminal cases whilst frequently clashing with his by-the-book superiors. His dishevelled manner and disregard for procedure belie a sharp instinct for detective work and a deep compassion for victims and the vulnerable. The series follows his investigations across multiple episodes, blending procedural drama with character-driven storytelling rooted in R. D. Wingfield's novels.