Return of the Emerald Skull

At a London boarding school, a series of eerie and sinister events gives messenger Barnaby Grimes the chance to test his developing knowledge of the ancient Chinese art of yinchido, a practice that focuses on the power of silence and empty spaces. When the pupils begin to be taken over by an evil spirit, Grimes must use this skill to uncover the source of the possession and stop the uprising. The story mixes mystery, supernatural tension, and the challenges of growing up.