Oliver Adventures of Oliver Bean: Oliver Bean and the Mystery Museum

Oliver Bean is back, and this time the field trip is supposed to be simple: one night at the museum, one boring tour, and absolutely no panic-worthy mysteries.
Unfortunately, the Mystery Museum has other plans.
When the famous Moonstone disappears during an overnight school visit, Oliver and his friends find themselves following strange clues through dark exhibit halls, whale-sized shadows, wax leaders, secret routes, and one very suspicious museum map. Oliver would prefer to stay calm, make a sensible list, and hide behind the nearest educational display. But with the clues getting weirder and the grown-ups missing the obvious, he may have to become the kind of brave he usually writes about in the margins.
Packed with diary-style humor, anxious-but-brave problem solving, and black-and-white Margin Mayhem illustrations, Oliver Bean and the Mystery Museum is a funny middle-grade mystery for readers who like clues, friendship, and heroes who are nervous but try anyway.