Infamous burglar "The Bat" commits a daring jewelry theft despite heavy police presence. Soon after, a bank theft occurs, which may be the work of the criminal as well. Meanwhile, Cornelia Van Gorder has various people arrive at her old mansion, including her niece, Dale, a bank employee, and police detective Anderson. When guests start turning up dead, Cornelia begins to suspect that The Bat may be lurking around the estate.
A vicious crime lord decides that he has had enough and much to the shock of his colleagues decides to give the business to his second in command and retire to Florida after marrying his moll. Unfortunately, he has no idea that she and the man are lovers.
A thug robs a young engaged couple of their last few dollars. When the thug's gang boss hears of the robbery, he gives them back their money and takes them under his wing. The thug, resentful of the couple, plans to organize a mutiny against the gang's boss, but when he is killed in a botched robbery, the police focus their attention on the young couple.
When actress Diana Baring is found in a daze beside her colleague’s murdered body, all evidence points to her guilt. During the trial, juror Sir John Menier doubts the verdict, but yields to pressure. Haunted by remorse, he launches his own investigation.
A distinguished English gentleman has a secret life--he is the notorious jewel thief the press has dubbed "The Amateur Cracksman". When he meets a woman and falls in love he decides to "retire" from that life, but an old friend comes to him with a predicament that entails him committing one last job.
Convicted of manslaughter for a drunken driving accident, Kent Marlowe is sent to prison, where he meets vicious incarcerated figures who are planning an escape from the brutal conditions.
After a vaudeville performer is murdered backstage, framed-up evidence lead the police to arrest a troupe member. At his trial, Hermann, a Scandinavian clown known as Beppo, is the lone juror holding out against conviction and pleading for his innocence and acquittal.
London, 1929. Frank Webber, a very busy Scotland Yard detective, seems to be more interested in his work than in Alice White, his girlfriend. Feeling herself ignored, Alice agrees to go out with an elegant and well-mannered artist who invites her to visit his fancy apartment.
Sir George hires Hillary Gatt to find out more about Eric who wants to marry Lois. Gatt is murdered and the couple, married, run off to India. Old friend John Beetham sympathizes with the bride who sees that her hubby is a liar and drunk.
A criminal known as Thunderbolt is imprisoned and facing execution. Into the next cell is placed Bob Moran, an innocent man who has been framed and who is in love with Thunderbolt's girl, without knowing of their relationship. Thunderbolt hopes to stave off the execution long enough to kill young Moran for romancing his girl.
Chick Williams, a prohibition gangster, rejoins his mob soon after being released from prison. When a policeman is murdered during a robbery, he falls under suspicion. The gangster took Joan, a policeman's daughter, to the theater, sneaked out during the intermission to commit the crime, then used her to support his alibi. The detective squad employs its most sophisticated and barbaric techniques, including planting an undercover agent in the gang, to bring him to justice.
An escaped convict and the detective tasked with hunting him down end up working in parallel to clear the convict's name and nab the gangsters that framed him.