Winner of the Hachette Children's Novel Award 2023

Can a distracted detective solve a mystery?

Hi, I'm Seven.

And I'm 13. (Yeah, my name can be confusing.)

So, here's the thing. Mr O, our caretaker at Riverside Academy, is gone. Maybe I was the last person to see him, out on the school field, and he didn't look good. Now, he's missing. And I have his keys.

Hang on, Mam's calling, again...

Supported by Arts Council England, this is an entertaining mystery for children aged 9+ who enjoy solving puzzles.