Slip (Leo Gorcey), Sach (Huntz Hall), Bobby (Bobby Jordan), Whitey (Billy Benedict) and Chuck (David Gorcey) unsuccessfully try to sell a dilapidated card to a street cleaner (Vince Barnett) for a fabulous amount, so they can get enough money to save Louie's (Bernard Gorcey) Malt Shop.
Sidewalk photographer Cathy Smith (Teala Loring) snaps a pictures of three bank robbers as they are fleeing a robbery but when the Bowery Boys and Cathy realize that Sach is also in the photograph, they break into the photo lab to destroy the negative, which might make the police think Sach was involved in the robbery.
An explosion in the lab, caused by one of the inventions of Professor Schrackenberger (Milton Parsons), brings in Detective O'Malley (James Burke) and his assistant Dugan (William Newell), who get the negative.
Gangster Ace Deuce (Sheldon Leonard), who actually engineered the bank robbery with Feather-Fingers (Lester Dorr), gives out the story that it was the job of a rival gang. Impersonating the rival gang, the Bowery Boys frighten Ace into giving them evidence that his boys committed the robbery. With one of the Professor's wild inventions, the Bowery Boys capture the gang and turn them over to the Police. They get the reward money and give it to Louie to save his shop, and Cathy gets a newspaper job as the result of her photograph.
Dawn Kennedy sings "I Love Him", written by the father-and-daughter team of Lou and Ruth Herscher, cute-and-cuddly Nancy Brinckman has a bit as a hatcheck girl, and Teala Loring brightens the landscape more than somewhat.
At the time this was made, Leo Gorcey was also appearing weekly on Bob "Bazooka" Burns N.B.C. radio program, and Sheldon Leonard could be heard on that network's "Maisie" show (with Ann Southern)as well as on the comedy program starring Parkyakarkus.
