Whipsaw is a 1935 American crime drama film directed by Sam Wood and starring Myrna Loy and Spencer Tracy.

Written by Howard Emmett Rogers, based on a story by James Edward Grant, the film is about a government agent working undercover traveling across the country with an unsuspecting woman, hoping she will lead him to her gang of jewel thieves.

When Ed discovers another gang, led by "Doc" Evans, has the same idea, he tips off the police to get rid of the competition.

Hearing the ruckus, Ross manages to toss the pearls out the window just before they break into the bedroom where he and Vivian are staying (pretending to be a newly married couple, but sleeping in separate beds).

Afterward, Ross exonerates Vivian from his hospital bed by having her answer questions "yes" or "no", nothing else, in the presence of his boss and a stenographer.

Mannix chastised cinematographer James Wong Howe for doing so, as MGM had spent millions glamorizing Loy.

[7][3]: 85–86 Frank Nugent, critic for The New York Times, described the film as "at once an effective melodrama and a pleasant love story.

"[8] Though he found the premise not particularly original, he wrote that "Sam Wood has directed it at a brisk pace and with a rare knack of making the expected happen in the most unexpected way.

Myrna Loy and Spencer Tracy demonstrate again that they are among the screen's most interesting players, and they are assisted most capably by the rest of the cast.