Xander is a shapeshifter. Stuck between good and evil, he waits to be marked—with the sphere that will identify him as a servant of the underworld; or with the water mark, serving the keepers. His twin sister, in love with a man bearing the water mark, wants Xander to follow the path of the good. But Xander is in love with a witch of the underworld. All he has to do to join her,is kill.