Overview
The Secret of My Success (also known as The Secret of My Success or: How Three Beautiful Girls Love for Fun—and Murder for Profit) is a 1965 British comedy film from American writer-director Andrew L. Stone, starring James Booth, Shirley Jones, Stella Stevens and Honor Blackman, along with Lionel Jeffries featured in four separate roles.
Plot
Thanks to his mother's help, Arthur Tate somehow makes a remarkable rise from a lowly constable to the ruler of a South America country.
His story begins with Inspector Hobart's investigation into dressmaker Violet Lawson's missing husband. Hobart suspects foul play and digs up Violet's cellar, looking for the body. Violet did indeed kill her spouse, but doesn't bury the corpse there until after Hobart has dug the hole. A helpful tip from Arthur's mum makes him the hero who solves the case.
Baron von Lukenberg is then arrested for creating a species of deadly spiders. But it is actually his wife, the Baroness, who is responsible. Arthur, with his mum's aid, once again saves the day. President Esteda of the South American nation of Guanduria is so favorably impressed, he hires Arthur to be his personal liaison.
From Wikipedia (CC BY-SA 4.0).