Tom Fitzgerald, alias The Great Brain, is back, struggling to stay reformed now that his friends have threatened to ostracize him if he puulls even one more swindle. But his brother J.D. knows Tom's reformation is too good to be true, and as a reformed Great Brain makes for a dull life, J.D. is not altogether unhappy--or blameless--when his brother's money-loving heart stealthily retums to business as usual. Under the watchful eyes of parents and friends, Tom has to be craftier than ever, and indeed he is. Whether he's cleverly pulling an out-and-out swindle so as not to be caught or solving a train robbery and murder, Tom's Great Brain never fails.