★First part of a fantastic new detective series full of excitement and humour
★A cheerful adventure with riddles and unexpected twists
★Captivatingly told by Julie de Graaf, with illustrations by award-winning illustrator Marieke van Ditshuizen

At De Clusius Primary School, no mystery goes unsolved.
Stolen keys, mysterious hamsters, or the missing coffee mug of Mr. Mark? The three best friends Lisa, Mats, and Ibi are on the case.
Together, they form the Schoolyard Detectives, solving both big and small mysteries.

Each of them has their own special talent: Mats can’t stand injustice.
Lisa has an excellent gut feeling when something’s not right. And Ibi?
His brain works like a computer – that’s how fast he can think. Together, they can solve anything. Or at least, almost anything...

Because when they discover that an age-old treasure might be hidden at their school, the trio faces their biggest mystery yet. And they’re not the only ones on a treasure hunt. Can the Schoolyard Detectives unravel this mystery in time?

With real historical riddles!

Julie de Graaf lives in Nijmegen with her family, their cats, and an ever-growing collection of Lego. She enjoys reading and baking bread, but her greatest passion is creating beautiful stories.

Marieke van Ditshuizen has been illustrating (children’s) books since 2010. Her style is known for being colourful, fresh, and timeless, with a touch of nostalgia and plenty of imagination.