Blackie runs into a woman he formally loved who now is married with a kid. When her husband gets out of prison he's killed in Blackie's apartment and of course the police thing Blackie pulled the trigger. Blackie must set out to prove his innocence as well as capture the real killers.

Chester Morris
as Horatio 'Boston Blackie' Black / Cyrus Peyton

Lynn Merrick
as Geraldine 'Gerry' Peyton

Richard Lane
as Inspector Farraday

Frank Sully
as Sgt. Matthews

George E. Stone
as The Runt

Claire Carleton
as Mamie Kirwin

Russell Hicks
as Attorney Harcourt (uncredited)

Charles Lane
as Hack Hagen (uncredited)

Erik Rolf
as Smiley Slade (uncredited)

John Tyrrell
as Policeman (uncredited)
CinemaSerf
The eponymous "Blackie" (Chester Morris) and his sidekick the "Runt" (George E. Stone) rescue a woman assaulted outside their apartment. The former soon recognises the lass as "Gerry" (Lynn Merrick), an ex-girlfriend heiress and what's more, she has a baby with her too! Who's is it? Who assaulted he...