After making a car-crash appearance on one of the country's most watched chat shows, down and out American comedian Johnny Lazar (Tim Guinee) is given one last chance of redemption by his agent Morris Feldmann (Lou Hirsch), who secures him a twelve-week tour of working men's clubs and universities in the UK under the watchful eye of major talent scout Brian Duffield (Danny Webb). But on his first night in the UK, Johnny is witness to a gangland hit in Picadilly Circus. Johnny initially tries to avoid becoming embroiled in the manhunt for the killer, but when the police issue an E-fit matching his description, his conscience begins to get the better of him. And when one of his fellow comedians, Nigel Perfect (Christopher Fulford) is murdered in a case of mistaken identity, Johnny decides to do the right thing by handing himself into the police. Unfortunately for them, Johnny's evidence puts the case against their prime suspect, Delroy Smith (Lennie James) in severe jeapordy.