Madhattan Mystery — John J. Bonk

All set to spend their summer in New York City with their aunt while their father is honeymooning with his new wife, Lexi and her younger brother Kevin's snoozy summer plans turn into high-stakes adventure when Lexi overhears a plot to steal Cleopatra's famous jewels from the Metropolitan Museum of Art. Joining forces with budding investigative journalist Kim Ling Levine, they ditch day camp to track down the thieves and rake in the reward money. Can Lexi, Kevin, and Kim find out who's behind the jewel heist without getting into too much trouble themselves?

For fans of the classic From the Mixed up Files of Mrs. Basil E. Frankweiler comes a hilarious whodunnit that will keep readers guessing to the very end.