Blackie goes after a gang that used a bazooka to rob an armored car, and then killed a cop who was a friend of Blackie's during the getaway. The only clue he has is that the the money was scorched by the bazooka's blast.
Blackie tries to clear an ex-convict who's charged with murdering a man in a restaurant phone booth. During his investigation he discovers that the restaurant is actually a front for a counterfeiting ring.
Blackie tries to help a man who is so desperate to get money for his child's medical bills that he's hired a hitman to kill him so the child will get the life insurance money.
Blackie helps Inspector Farraday try to find out who planted a bomb in his Dictaphone and took a shot at him. He soon finds that someone has planted a bomb in his own car.
When the plans for a new metal being developed by the government are stolen, Blackie and Inspector Farraday butt heads over the best way to recover them.
Mary gets Blackie to help the husband of a friend. He turns out to be a man who was killed by a poisonous dart from a blowgun. After Blackie begins his investigation the wife is killed the same way.
When a wealthy man out riding his horse in the park dies of a heart attack, Blackie suspects that it may have actually been murder. His investigation uncovers evidence that points toward the man's gold-digging fiancée.
Two sisters stage a series of robberies and, with the help of their henchman, commit a couple of murders. Blackie is on their trail after they kidnap Mary.