The Silver Boy by Kristina Ohlsson
They thought ghosts didn't exist . . .
But when Aladdin's parents discover food is being stolen from their restaurant, he and his friends decide to investigate.
Soon, Aladdin notices a strange boy - dressed in short trousers, despite the freezing cold. But as hard as he tries to catch him, the boy always disappears - leaving no tracks in the fresh snow. Before long, Aladdin and his friends are pulled into a web of secrets and history, treasure and crime.
Can they uncover the mystery of the curious Silver Boy?