When sixteen-year-old twins Emma and Evin LeFay are suddenly forced to pack their belongings after the tragic murder of their mother, they soon find that the busy city life of Boston, Massachusetts is more than they could have expected... First are the two mysterious boys that Emma crosses paths with one night, after being caught in the wrong place at the wrong time. She thought she escaped them without getting caught, but it soon becomes apparent to her and Evin after a series of strange events that someone--or rather, several people--seem to be following them. It's after a close-run in with a group of menacing creatures, and the sudden aid of the same strange people that have been following them that Emma and Evin quickly realize there is more to Boston than skyscrapers and noisy cars. Left with no other options and seeking the truth behind their mother's murder, Emma and Evin accompany their saviors to a place known as Hawthorne Academy. It's here that the twins soon learn they are part of a supernatural race with rare abilities, known as Dracons, one Otherworld race amongst four other paranormal races that have lived in disguise as humans for centuries. Being part of an Otherworld race has its drawbacks, however, when Emma and Evin are enrolled for training at Hawthorne after a heated meeting with the Otherworld Council and its leaders. It's either sink or swim for these Otherworldly twins as they train at the academy and learn to control their unique gifts. Convinced life couldn't get much more bizarre, Emma and Evin discover a mysterious archway leading to an entirely different realm that has been lost over time. It's in this Lost Realm and the Celestial kingdom of Evmurah that the twins are dubbed the Guardians of the Realms, protectors of both the Mortal and Immortal Realms. It's Emma and Evin's job to protect both realms from the darkness that taints them and the mysterious Precursor that seems to want them dead. 

It's been one month since Emma and Evin Lefay's encounter with the vengeful Caine Fletcher, and just as they are beginning to hope things can return to normal--or as normal as the Otherworlders' lives can be--the twins are attacked one night in a graveyard by mysterious, mask-wearing Stiffs... The twins learn the masked Stiffs are known as Venators, and are part of a secret society, whose sole purpose is to extinguish all Otherworld beings. If that's not enough, strange things are beginning to happen to Emma and Evin. Emma begins having preminitions, and Evin discovers he has the sudden, phenomenal ability to supernaturally heal his own wounds. Meanwhile, Tristan's sister is in town, and she's causing more trouble than good--mainly in Evin's love life. With two very different girls vying for his attention and only one girl worth chasing after, how can the Guardian possibly be expected to concentrate on much of anything else? As if they aren't already overwhelmed enough, the leader of the Boston Otherworld Mafia has taken a sudden interest in the Guardians. "Marco Polo," as he is called, promises to help Emma and Evin with the Venators--for an unlisted price. Things are quickly spinning out of control for Emma and Evin... Will they conquer the threats that face them? Or have the Guardians of the Realms finally met their match?