In 1933 the play was adapted into a film Leave It to Me directed by Monty Banks and starring Gene Gerrard, Olive Borden and Molly Lamont.
At the castle is the Earl of Middlewick, his butler Bellows, his youngest son Freddie, and his secretary Baxter.
Freddie's stepmother, Lady Middlewick, has inherited a diamond necklace (to the chagrin of second cousin Ethelberta).
He has inherited five thousand pounds, but Lady Middlewick must sign any cheques drawn by Freddie against his legacy, and she disapproves of the investment.
Freddie and Phyllis see an advertisement offering Psmith's services for any job whatsoever.
Psmith takes Walderwick's umbrella from the nearby Morpheus Club and gives it to her.
Eve talks with club waitress Miss Rumbelow, sees Psmith again, and returns the umbrella.
Lord and Lady Middlewick, Ethelberta, Baxter, and Psmith enter, and everyone settles down to drink coffee.
Lady Middlewick announces that Miss Peavey and Mr McTodd are going to read their poetry for them.
Lord Chipstead, Walderwick's father and Lady Middlewick's cousin, also joins the party.
Miss Peavey and Psmith (as McTodd) sign their names in Baxter's autograph book.
Cootes appears again, pretending to be Ralston McTodd and hoping to steal the necklace, but Psmith stops him and lets him go.
Miss Peavey and Cootes plan to turn off the lights and take Lady Middlewick's necklace.
The third act takes place the next morning, in a keeper's cottage at Blandings where Psmith is staying.
After Mr and Mrs McTodd arrive, Baxter and Lord Middlewick question Psmith about his identity.