Aleah Jean, better known as A.J., has a copy-cat problem, and her name is Brooklyn. Ever since the start of the third grade, Brooklyn has been copying everything A.J. says, does, and wears. It is so annoying! A.J. and her best friend Ashley decide to form the Double Detectives Spy Agency and get to the bottom of the copy-catter's true motive. By becoming a detective, what bizarre things will A.J. discover about Brooklyn? Better yet, what surprising truths will A.J. discover about herself?