Shh, listen… do you hear it?

Is it the breeze in the tall grass?

Or is it… something – someone – sinister?

The children at Cowslip Grove are preparing for a school play, and Kat, Levi, Donte, and their friends have roles in it. But one day, during rehearsal, a piece of chalk flies on its own and starts writing on the board. Soon the children realize they are being watched by the mysterious Little Nobody – an invisible child without memories.
As the children begin to unravel the mystery surrounding Little Nobody, they uncover a strange secret world – and with it the true fate of many long-lost children and creatures.
But there is also something else watching: an undead enemy who wants to exploit Little Nobody to bring great harm to Cowslip Grove. And the children must fight with all their might to defeat him.