The Undivided are divided.

The psychic twins Rónán and Darragh have been separated by a traitor Druid, Amergin, who has thrown Rónán through a rift into another reality. Now time is running out for Darragh. If Rónán isn't found soon, they will both die.

Meanwhile, Ren Kavanagh has no notion of where he comes from and is plagued by mysterious injuries. Then he meets the enticing and mysterious Trása, and before he can figure out how it happened, he is in serious trouble ...

Ren's life is about to become more bizarre and dangerous than he could ever have imagined.