Episode 17, "Error at Daybreak" benefits from a better than usual cast, and a script that provides quite a puzzler. Colonel March is vacationing at the beach, and thus is on hand to see the bad heart of unscrupulous businessman Norman Kane (Lloyd Lamble) giving out just as he's about to make another dive into the ocean. Dr. Robert Hastings (Robert Brown) confirms there is no pulse and runs off for help, while March discovers blood and a sharp needle, indicating murder. Suspicion immediately falls upon Kane's secretary, Marion Williams (Patricia Marmont), who could have fired the pointed needle using an air rifle. Inspector Ames (Ewan Roberts) reveals that Kane had just withdrawn the entire amount of his considerable worth, and was about to be arrested for swindling. Colonel March begins the case with little Roger (Richard O'Sullivan) calling attention to the theft of his small rubber ball, just as his nanny Clara (Adrienne Corri) had planned to run off to France to marry Kane, but where it turns up reveals the truth about all the varied plot threads. Patricia Marmont was the daughter of actor Percy Marmont (seen in "Death and the Other Monkey"), and beautiful redhead Adrienne Corri was no stranger to Boris Karloff, later appearing with him in 1958's "Corridors of Blood." Robert Brown made a fine villain on THE AVENGERS, and replaced the late Bernard Lee as 'M' in the James Bond series during the 80s.