Armed with a notepad, a lollipop and an overactive imagination, Jacob spends his school week solving the mysteries of St Jude’s Primary: missing snacks, sabotaged swings, cheating scandals and suspicious teachers.

But when toys and Pokémon cards begin disappearing across the school, Jacob finds himself on his biggest case yet. The clues don’t add up, the suspects keep piling up, and somebody in St Jude’s is hiding something.

He'll need to stay up past bedtime to solve this one.