Twelve-year-old Cassie is an only child who has cerebral palsy. She has always felt an empty space where a sibling should have been. When she finds an ultrasound in her mother's office, she is thunderstruck to learn that she had a twin who disappeared before birth. Her mother explains that both she and Cassie are chimeras, carrying traces of the vanished twin's DNA.She never imagined that secret would matter-until the day her mother disappears. Strange signs begin to surface around town, and Cassie is left with questions no one can answer. Then, a mysterious boy appears, claiming to be the twin she never knew: Orion. He knows that Cassie's mother is in serious danger.With Orion as her unlikely guide, Cassie is pulled into a hidden world of ancient forces. The two race against time, discovering their strength and learning that the bond between them may be the key to finding her mother before time runs out.A story of magic and family, Carla Beene's THE TWIN WITHIN is a heartfelt adventure about courage, the power of love, and an unbreakable bond between siblings.