A young man approaches his favorite detective, the world-famous Charlie Carter (Harley), and asks for help to prove he wasn't responsible for his mother's death. Harley can't say no to someone who also grew up without a mother, and finds a cold case that only he and his best friends, Sam Shaw and Dave Leigh are willing to re-open.

Carter wants to learn how to use a gun and makes his housekeeper, Dot, give him shooting lessons. When they discover the body of a partner in a tech startup that was about to be sold for millions, everyone at the company becomes a suspect. Harley learns there's still a big difference between himself and a trained police officer.