Introverted Annie Sky was as a fairly normal girl living a fairly normal life, despite grieving her mother's death. Then, in a bizarre turn of events, the discovery of a mirror hidden in an antique bookstore catapulted her into a world of adventure and peril. Now, returning from the grueling expedition, Annie is back on Earth, but the troubles of the mystical world she had stumbled upon quickly find their way back to her, and with it, the Watcher she left behind. Hiding the handsome, enigmatic Phoenix becomes a daunting task, and as peculiar events start unfolding around them, such as vegetation from Phoenix's realm sprouting in Annie's backyard and inexplicable abductions, tensions rise and nothing except Phoenix's warm embrace feels safe.
As the Watcher's departure looms, can Annie endure another heartrending goodbye? And once strange transformations take hold of her body, how will she react? When two drastically different worlds crash, Annie and her friends must unravel a fresh batch of cryptic riddles before time runs out and humanity is forever doomed.