Alec Cawthorne in a curious case in terms of film credits. His only film credit, in the classic Sleuth (1972) is a mere case of credit only despite being listed along heavyweights and Oscar winners Laurence Olivier and Michael Caine. Cawthorne does not exist - just as his other credit only colleagues John Matthews, Eve Channing and Teddy Martin (all in their only film... imdb.com