Sam investigates the background of an eastern European diplomat accused of a violent assault on a prostitute and learns he could be a murderer. The pressure is on when it emerges the suspect has full diplomatic immunity and is due to be deported within twenty-four hours. Phil and Grace interview a painter, whose valuable nude portrait of an ex-lover has been stolen. Leela accepts a post outside Sun Hill, unaware that her colleague Stone has pulled strings to ease her departure.