The film stars Loretta Young and David Niven, and also features a strong supporting cast including Broderick Crawford, Billie Burke, Eve Arden, ZaSu Pitts, and C. Aubrey Smith.

[2]Anita Halstead (Loretta Young) goes to see a magic act performed by Tony (David Niven), the "Great Arturo", after her bridal shower for her wedding to Don Burns (Broderick Crawford).

One night, Tony becomes drunk in the company of a woman reporter and boasts he will jump out of an aircraft at 15,000 feet (4,600 m) with his hands handcuffed behind his back.

When she prints his claim, he first tries to get out of it with a fake cast on his arm, but when he sees the thousands of fans, he goes through with it, freeing himself in mid-air and parachuting safely to the ground.

Tony tells his valet and friend Benton (Hugh Herbert) that he hid a lockpick in the wrong airplane, but goes ahead with the trick anyway.

Screenwriters Gene Towne and G. Graham Baker made so many changes that Wanger eventually billed the film as an original screenplay.

Wanger and director Tay Garnett used footage of their around the world trip that they shot for Trade Winds (1938), their previous collaboration.

[3] Paul LePaul, the magician who was a technical adviser to Eternally Yours has a cameo doing card tricks with Hugh Herbert.

But its real novelty is Mr. Niven as a magician and Miss Young as the lady he first carelessly causes to disappear, and then pursues to the four corners of the earth.