Mount Emily

While digging around their school's backyard in search of an urban legend, Patsy Goh and her best friend Elena are whisked back in time to 1987. Trapped in their mums' 13-year-old bodies, the duo race against the clock to hunt down the magical time crystal that got them in this mess, before the evil Midnight Warriors find it and cause a time crisis that could destroy all of existence.

Patsy and her best friend Elena travel back to 1987 again to save Charlotte and her mum, who have been kidnapped by a member of the Midnight Warriors cult. As their adventure plays out, Patsy discovers she may also be a Keeper of Time!

When Elena discovers that she might not actually be a Time Keeper, and is instead a Midnight Warrior, she suffers from a deep identity crisis. Together with her best friend Patsy Goh, she once again travels back in time to her mother's teenage years, where she attempts to prevent her mother from meeting her father, in order to save them from a disastrous marriage. But can they really change the past?

In the concluding book of the Mount Emily series, Patsy and Elena are now in Secondary Four and face having to leave Mount Emily Girls' School by the end of the year. However, they soon find that graduating from their beloved school is the least of their concerns, as unexpected circumstances lead them to have a final showdown with the Midnight Warriors, and in so doing, change the course of time travel forever.