The Return of the Great Brain (Great Brain #6)
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 returns 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.