Crimes and Mister Meanors (2015)

Jake Harvard, 13 is not happy when he learns he has to spend the summer with his uncle Benny, a middle aged detective in suburban Washington DC. Jake meets a young girl named Kat Adams who has a passion for American history. After uncle Benny turns away a client named Lola Meanors who is looking for her missing husband, Jake and Kate start their own secret investigation.