Working from his home in a converted windmill, Jonathan Creek is a magician with a natural ability for solving puzzles. He soon puts this ability to the use of solving impossible crimes and mysterious murders.

Steve Coogan plays Tommy Saxondale: an ex-roadie with anger management issues and a pest-control business. Tommy is a little arrogant, a little egotistical and feels the world owes him more respect than it typically shows him. He has an assistant named Raymond who lives in a spare room in Tommy's house, a live-in girlfriend named Magz who owns a T-shirt business, and a receptionist named Vicky who has a tendency to drive him up the wall.