Cover of The Oak Creek Trio and the Locked Treehouse Chest
Case #3 β€’ Book 3

The Locked Treehouse Chest

Ages 6–9 7 Chapters Live on Amazon

A loose floorboard inside Acorn HQ reveals a hidden wooden chest carved with the initials B.Q. With Founder's Day approaching, the trio must discover who hid it, locate the missing key, and uncover the piece of Oak Creek history locked inside.

About This Mystery

Open the case

A routine repair at the trio's treehouse headquarters becomes Case #3 when Leo, Max, and Maya discover an old locked chest hidden inside the oak. The initials on the lid point toward Barnaby Quill, but the key is nowhere to be found. Maya builds a Magnet Wand, Leo follows the history, and Max keeps the search moving as a school anniversary deadline closes in. The Locked Treehouse Chest blends a present-day mystery with a heartfelt connection to Oak Creek's past.

Keep investigating

Every Oak Creek Trio book unlocks more reader activities. Book 1 starts with a parent email; later books use the Detective Code found at the end of the book.