The Case of the Library Lock-In Secret: The Anna & Ava Detective Agency, Book 12 (Paperback) (ISBN-13: 9798253303887)

Locked in overnight.

A missing key.

And a secret hidden behind the shelves.

When Anna and Ava attend a library lock-in, the night takes an unexpected turn when a historic brass key disappears from a display case-without a single sign of damage.

No broken glass.

No forced entry.

Just one careful removal.

As the library doors lock for the night, the suspects are limited-but the mystery grows deeper. A shifted bookshelf. A hidden door. And a truth someone isn't ready to share.

But Anna and Ava don't guess.

They confirm.

In this thoughtful mystery, the sisters uncover more than what was taken-they discover why it was taken, and how even good intentions can create confusion when the full story isn't told.

Perfect for readers ages 7-12 who love:

- Smart girl detectives

- Realistic mysteries in familiar places

- Stories about truth, trust, and teamwork

Because sometimes solving the case...

means understanding the story behind it.