Benny's head is left reeling and he wants to swap back before sunset, but requires a hobbledehoy.

Benny and Moon face the greatest Nekross attack yet after Tom gets injured and his family journeys to Tibet in search of the cure.

Tom fights for his life in the Cave of Healing. But left alone, Benny and Randal Moon must work together to find the only thing which can defeat the Nekross assault – a long-lost magical mirror. Can the scientist and the Hobgoblin become friends for long enough to outwit the Nekross – or will Lexi find Tom before it's too late?