Robert surprises an intruder in the house that evening. He is closely followed by Angela, who to her great shock recognises her "dead" husband Simon (Patrick). He signals to her not to let Robert know his identity. Later he comes up with elaborate excuses to Angela to explain his resurrection and lack of contact since the war, but she soon sees through the lies. It is subsequently revealed that, far from dying a hero's death on the battlefield, Simon was a deserter who faked his own death. Since the war he has been making a living on the wrong side of the law as a black-marketeering spiv. Now down on his luck, he has returned (in the stolen car) to try to extort money.

Angela has to let Joan in on Simon's return from the dead, and the two try desperately to shield Robert from the knowledge of his son's return in such circumstances, aware that the shattering of his illusions would destroy him. The unscrupulous Simon, learning of Angela's new attachment to Maxwell, demands £5,000 to leave for good. Robert gradually comes to realise that something very strange is going on, and little by little manages to piece together that Simon is in hiding somewhere in the house. He finally manages to track him down and a struggle ensues, climaxing with Simon falling to his death from a balcony. With his son's perfidy finally revealed to all, Robert agrees to change the dedication of the pavilion, as Lord Clandon had requested all along.