The literary Charles Hood character is considered a James Bond type. Novelist Stephen Coulter was a friend of Bond creator Ian Fleming who had served with Fleming in the British Intelligence section of the Royal Navy during the Second World War. Both became journalists and wrote for both Reuters and the Sunday Times. 'Shamelady', the title of the third Charles Hood novel, is a phrase that is also associated with Ian Fleming. Coulter provided background information for Fleming's first James Bond novel 'Casino Royale'.
According to the Volume 131 edition of 'The Film Daily', shooting was delayed when Vince Edwards fractured a bone during filming of the movie in Portugal.
This movie was made and released about four years after its source novel of the same name by Stephen Coulter (as James Mayo) was first published in 1964. It is one of only two movies made into a film from one of Coulter's books - the other picture is Shannon senza pietà (1972).
Stephen Coulter (as James Mayo) wrote five Charles Hood novels of which 'Hammerhead' (1964) was the first. The remaining four (none of which have been filmed) were 'Let Sleeping Girls Lie' (1965); 'Shamelady' (1966); 'Once in a Lifetime' aka 'Sergeant Death' in the USA (1968); and 'The Man Above Suspicion' (1969).