Garfield and Marshall have to decide if a suspect is an innocent philanderer or a ruthless criminal when they investigate the disappearance of £4,000 from a safe on a building site. When they find the suspect in possession of a number of fake driving licences, they suspect that it is not the first time that he has committed such a crime – and true to form, when they discover his real name, they find a string of offences to go with it.