It’s been several years since Mierna has last seen the púca Vlanders. Both her room and office are decorated with painted memories to remind herself that what she has witnessed was real. A parallel world called the Fae does exist, and with it the creatures she enjoys reading about in her many books. But on one particular night, a nightmare brings the uneasy feel that the púca's return will be less than charming. 

She awakens to her supervisor’s phone call to head into the office. As a recent medical graduate and doctor-in-training, Mierna has no choice but to follow orders. Upon her arrival, she finds the office empty with a questionable figure posing as lead doctor. Mierna attempts to escape but winds up trapped in a back office. With no other option, she prepares to face her shape-shifting assailant when Vlanders' timed arrival throws Mierna into his world. Reunited with the cheerful púca, she explores what was once only imagined. 

Although Vlanders keeps a world of secrets, Mierna learns through a series of mishaps that dreams and nightmares have different roles to play between both worlds. They are what tie Dreamers to the Fae and keeps its inhabitants secure. Without them, belief is lost, causing the world to cease functioning and release harmful creatures held by the Tree of Eternity. Mierna cringes at the possible thought of Nightmare Incubus, along with other oddities, roaming between worlds unchecked.

Through a set of Dream Sequences, Mierna is able to temporarily teleport, not only discovering that nightmares are being misused, but may lead to the release of the one they all fear most. In a world where truth is often times obscure, Mierna must find a way to secure the Fae for future generations. All eyes are turned to the mountains of Tall Cliff, where the Keeper of Nightmares holds the secret to it all.