'This story is full of adventure and heart! A real page turner!' Dani Harmer

'Warm, funny, pacy, endlessly inventive and life-affirming; there are lots of young readers who will identify with Rory' Chris Beckett, Arthur C. Clarke-Award winner

Eleven-year-old Rory Hobble has it tough: he gets upsetting thoughts all the time and they won't go away – 'Obsessive Compulsive Disorder (OCD)', the head doctors call it. His mum hasn't been very well for a long while either. Perhaps it's his fault... Maybe that's why she doesn't always feed him; maybe that's why she screams at him. At least Rory has his telescope – gazing at the unchanging stars keeps him calm. But, one night, Rory sees something impossible in the sky: mysterious lights – artificial and definitely not of earthly origin.

When his mum is abducted by the shadowy Whiffetsnatcher, Rory – accompanied by his space-faring, care-experienced social worker, Limmy – travels beyond the Earth, chasing those mysterious lights to the frozen ends of the Solar System. Along the way he must outwit a breakaway human civilisation living on a Martian moon; survive the threat of otherworldly monsters; and learn to speak to alien whales.

But his greatest challenge left Earth with him and it will take all the courage he has not only to overcome his OCD, but to decide whether he wants to rescue an abusive mother if he gets his chance...