Robert Carlton, amateur detective, receives a call from a friend in the secret service who explains that a number of banks are hard hit by a band of clever currency imitators. Carlton agrees to work on the case. He learns that the president of the First National Bank associates with a well-known crook. Carlton is engaged as the banker’s chauffeur and one night follows the banker to a hut on the waterfront, where the spurious currency is made. He learns that the counterfeit money was put in circulation with the aid of the banker, and that the crook has turned blackmailer. Carlton sends word to the secret service man to be at the banker’s house that night. That night the crook shoots the banker and escapes. Carlton is the first person on the scene. The banker’s daughter discovers him there and believes him to be the guilty party. Instructed to keep his identity a secret, Carlton allows himself to be arrested. The government agent then examines the retina of the dead man’s eye with a powerful magnifying glass. On the day of Carlton’s trial the crook shows up in the audience. The secret service man produces a photograph of the dead banker’s eye. In the retina can be seen an image of the crook. He looks at the picture and commits suicide. The fact that the banker was crooked is concealed by Carlton for the daughter’s sake, and in the end there is the suggestion of a future romance between the amateur detective and the banker’s daughter.