The Secret of My Success is a 1965 British black comedy film from American writer-director Andrew L. Stone, starring James Booth, Shirley Jones, Stella Stevens, Honor Blackman, and Lionel Jeffries (in four roles).

Arthur goes back to England to the Earl's mansion to collect, intending to give all the money away to charity, but leaving it to his mother in case of his death.

The Monthly Film Bulletin wrote: "It is a sad fact that since setting up headquarters in England, the Stone team seems to have lost most of its freshness and technical audacity.

Although its full potential is not worked out, the third story has its moments, notably Shirley Jones stopping in mid-conversation to sing the Guandurian national anthem, and some comic business in a theatre involving an ill-rehearsed flying ballet.

As is customary with the Stones, almost everything is shot on location (this time in a variety of luscious baronial halls), but the treatment is very anonymous: the sooner they get back to forest fires and train wrecks the better.

"[2] British film critic Leslie Halliwell said: "Flabby portmanteau comedy full of in-jokes and flat-footed farce; satire is not evident.