Myrna Loy plays the glamorous member of a trio of jewel thieves. G-Man
Spencer Tracy goes undercover to join the gang when it transports its stolen jewels from Paris to New York. Loy falls in love with Tracy, has a change of heart, and quits the gang. But Tracy arrests her all the same when he recovers the jewels. The girl forgives Tracy when the latter is wounded in a climactic gun battle with the rest of the thieves. Why, oh why, is this thing called Whipsaw? ~ Hal Erickson, All Movie Guide