Hell Fire: The Moondial, Book 3 (Unabridged‪)‬

Prophecy tells of a boy that could save the Seven Worlds after the fall of the Moondial and the scattering of the seven stones of power. Peter Calender is that boy. He had been given the Moonstone, one of the stones of power. Death, betrayal and evil all follow in his wake as he tries to make sense of his ever-changing life. Alone in a strange land, he is in need of help, and this comes from unusual sources. 

In Book 3 of The Moondial Series Peter is close to death and his companions are in search of the Star Ruby, the one stone of power that could save his life. Nightjar is desperate to save Peter and will stop at nothing, but there are others who would stop at nothing to ensure she fails.