Cloud Cat (Year of Changes series)

Luka has always known he's different. Only Luka can hear the call of the Cloud Cat. And he has to follow it, even when it leads him straight towards danger, old magic, and the Bone Cracker. Jez can't see the strange creatures his brother senses, but with both parents lost, he is desperate to keep Luka from slipping away too. Could Luka fall too far, out of our world and into another?