Sir Brian Brooke, a famous attorney, collapses while acting as defense counsel in a high-profile murder trial. Doctor Thorvald informs his (second) wife Cathy that Brian needs to rest for six months or he will die; Brian is also temporarily blind. They and Brian's daughter Monica relax in Italy.
They receive an anonymous letter accusing Cathy of carrying on an affair with Brian's junior partner, Michael Barcleigh. Brian's lawyer instincts makes him believe it, until Cathy reveals that Michael has confided to her that he is in love with Monica. Brian is apologetic, and delighted by the news. However, Cathy has lied, and the letter is correct.
^Porter, Vincent (2000). "The Robert Clark Account: Films released in Britain by Associated British Pictures, British Lion, MGM, and Warner Bros., 1946‐1957". Historical Journal of Film, Radio and Television. 20 (4): 489. doi:10.1080/713669742.