Jack is joined by earnest new partner Georgina 'George' Dixon to investigate the murder of car salesman Carl Mercer,whose corpse is found in the boot of a car at his work-place. Jack is convinced the killer is one of his work colleagues,including service manager Dave Jackson and his daughter,receptionist Debbie,who was engaged to Carl,or sales rival Emma. Top of the list is Debbie's jealous ex-boyfriend Ryan Kinnock,who detested Carl. To lazy Jack's annoyance George makes him help her check the suspects' phone records and he actually finds the person who had sex with Carl the night he died. This in turn leads to George unmasking the killer.