The fifth volume in the chronicles of Craig Kennedy, scientific detective, takes up the familiar and successful formula for a new round of adventures. Craig Kennedy continues to amaze with his usual sorts of crimes – jewel theft, missing persons, wrongly accused suspects, fixed horse races, arson, murder, and blackmail – but he uses scientific procedures to analyze the evidence, sometimes involving fantastical devices. „The Social Gangster” is the story focused on a mysterious robbery, which gives a glimpse of a greater threat hanging over social life of big city youngsters. But no one seems to be concerned enough with it, until it is too late. It is up to Kennedy and his science to resolve the case and reduce the impact falling on the society.