This hardboiled crime story stars stoic noir staple Alan Ladd as Al Goddard, a special investigator sent to Gary, Ind., to solve a postal detective's murder and track down the sole witness to the act: shy young nun Sister Augustine (Phyllis Calvert). With her reluctant aid, Goddard learns the identity of the culprits and soon uncovers their gang's plot to pull off a million-dollar mail heist. Jan Sterling is a standout as gun moll Dodie La Verne.