The Crabbes holiday in London in a flat owned by ex-policeman Nick Spencer whilst he is in America on business. However Margaret finds his packed suitcase under the bed and hears an answer-machine message from his daughter warning that her violent ex-con boyfriend Danny is on his way to see him. Henry discovers Nick in hiding whilst Margaret discovers Danny's corpse in the dust-bin, killed in self-defence by Nick. Henry's loyalty is put to the test, as is the patience of Sally and Gary when the agency staff turn out to be a quarrelsome married couple.