On a country road under cover of darkness, the tires are transferred to Joe Wembley (Frank M. Thomas), an underworld figure and operator of a nightclub at the beach.
With the $50,000 earned from the transaction, Evelyn Harris (Doris Lloyd), who inherited the tire business from her late husband, plans to marry Eddie Moore (Jerome Cowan), a singer at Wembley's café.
In San Francisco private detective Jess Arno (William Gargan) succeeds in clearing actress Dolly Adair (Phyllis Brooks) of a murder charge and becomes a media sensation.
After the trial is over, Jess rushes to phone his sweetheart, June Terry (Margaret Lindsay), a real estate agent at the shore.
After the police leave, June admits her involvement in placing the dummy and offers to help Jess discover the identity of the murdered woman.
After Moore denies killing Evelyn and accuses Wembley of engineering the murder and hijacking the tires, Jess phones Capt.