A police detective uses fluorescent powder to catch a pickpocket and her gang.

Edward Arnold
as Lt. Lorrgan

Selena Royle
as 'Ma' Abby Dibson

Tom Trout
as Lefty Dibson

Audrey Totter
as Jessie Belle Dibson

Dan Duryea
as Posey Dibson

Hume Cronyn
as Keller

Dorothy Morris
as Rosalie Dibson (as Dorothy Ruth Morris)

Wally Cassell
as Jenkins (uncredited)

Kernan Cripps
as Police Scientist (uncredited)

Tom Drake
as Radio Broadcaster (voice) (uncredited)