Twelve-year-old Zhi Ging has always been an outcast. Until she receives an invitation to Hok Woh, an underwater school that offers her the chance to become immortal, and to finally belong.

There, she battles in hair-raising boat races, meets ageshifting tutors and competes in thrilling trials.

But there are rumours of a growing dark force . . . and students who fail the trials are disappearing. Can Zhi Ging uncover the truth before it's too late?