The Purple Gang, led by Eddie Fletcher, specialize in small-time kidnapping focusing on minor mobster that can fetch them a few thousand dollars in a short period of time. They may have bitten off than they can chew when they grab Jan Tornek. He is ostensibly an antique shop owner in business with his brother-in-law Eric Vajda. In fact, he's a messenger for the Capone mob, regularly collecting shipments of narcotics. Ness had been observing Tornek for some time and when he misses picking up a drug delivery, he's soon on to Mrs. Tornek who has already received the ransom demand. She works with Ness but Fletcher is soon on to them and they nab her brother, Eric Vajda. The case gets complicated when Capone's top enforcer, Frank Nitti, starts to negotiate for Vajda's release.