Fitzgerald--better known as the great brain--has turned thirteen, and pretty polly reagan has put a spell on him. But when it comes to swindling his youn tom d. But when it comes to swindling his younger brother j. D., a...Fitzgerald--better known as the great brain--has turned thirteen, and pretty polly reagan has put a spell on him. But when it comes to swindling his youn tom d. But when it comes to swindling his younger brother j. D., and all the other kids in adenville, tom hasn't changed a bit.