The infant son of one of England's most popular celebrity couples is stolen from his cradle. MI-5 is called in for political cover to show that everything is being done to find the child. Meanwhile the treasury minister calls Harry for help with a small problem involving a woman who is not his wife - which rapidly becomes a big problem when she turns up dead. Fiona goes undercover in the celebrities' house to gain the wife's trust and find out what they're not telling the authorities.