When a shot is fired at a charity fundraiser, host Malcolm Powell is found dead in his study. Malcolm's PA, Vicky is certain she knows who the culprit is - a mystery man named Jack Roberts who had an appointment with Malcolm and was seen arriving and then fleeing the scene of the crime. However, when Richard and his team pursue the suspect, they find his abandoned car nearby with no clues as to his whereabouts or motive for killing Malcolm.