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The Case of the Midnight Locker Note: The Anna & Ava Detective Agency, Book 5
Paperback
Chapter BooksFamilyGeneral Juvenile Fiction
Publisher: Independently Published
Published: Feb 13 2026
Pages: 80
Weight: 0.23
Height: 0.19 Width: 5.50 Depth: 8.50
Language: English
The Case of the Midnight Locker Note
The Anna & Ava Detective Agency (Book 5)
The note wasn't signed.
It was written in thick black marker.
All capital letters.
Pressed hard.
CHECK YOUR LOCKER.
By morning, more notes appear.
LOOK BEHIND YOU.
LOOK CLOSER.
RETURN WHAT IS NOT YOURS.
Whispers spread through the hallway.
Students glance over their shoulders.
And someone's name begins to fill the blank.
AnnaBelle knows patterns matter. Same marker. Same style. Same timing. But patterns aren't proof.
Her younger sister Ava notices something else.
The notes don't feel angry.
They feel... unfinished.
As the sisters open their fifth official case, they discover this mystery isn't about threats at all. It's about lost items. About quiet help. About what happens when a good intention is left without a signature.
Because when a message has no name, people guess.
And guessing can grow louder than truth.
Warm, thoughtful, and grounded in real-life school moments, The Case of the Midnight Locker Note is a heartfelt chapter book mystery for readers ages 7-12 who love:
- School-based mysteries
- Detective stories about fairness and clarity
- Realistic sibling dynamics
- Stories about courage and communication
- Mysteries where solving means understanding
This isn't a story about catching a villain.
It's a story about signing your name.
The Anna & Ava Detective Agency is officially open.
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