Anecdotes

The ship at the beginning of the picture is the S.S. Moreton Bay. She entered service in 1921 as a passenger and cargo ship. She was used by Australia during World War 2 as an armed merchant and troop transport. She returned to commercial passenger service in 1946 on the London to Sydney route. Her last cruise was in 1956 and she was scrapped in 1957.

Film debut of Billie Whitelaw.

Hollywood seems fixated on the fake painting switch plots from this movie all the way up to Oceans 8, as well as Perry Mason.

First film directed by Godfrey Grayson that was not made by Hammer Film Productions.

Marianne Noelle's debut...