By Joan Aiken
Published Sep 2018
He turned sideways and disappeared, as if into a vertical crack in the air…
After the strange disappearance of his mother and older brother, Cosmo is sent to live with his cousin. Lost and lonely at his new school, Cosmo escapes at weekends to the peace of his cousin’s ancient mill house, and the shadowy companions only he can see. When he learns about the family curse, he realizes his ghostly visitors have a message for him – but are these new companions friends or enemies?