Gary Johnson (Glen Powell) is a straight-laced professor with a dangerous secret identity: he's a hitman. Sort of.
Working undercover to entrap criminals for the local police department, Gary falls into the role of 'hitman' with surprising ease. But his talents for disguises hit a roadblock when he meets, and starts to fall for, prospective client Madison (Adria Arjona) – until layers upon layers of deceit turn their budding romance upside down.