Sometimes I forget for an hour or two that she’s with me. Sometimes I convince myself that she was only a dream. Or that I’m crazy. But then, for no reason I can name, I’m instantly aware of her company, or I hear her whisper in my head. And that’s when I remind myself that she’s been there all along, as constant as my heartbeat.
For as long as Lily Winston can remember, she has never been alone. Iris, a shadowy figure who mimics Lily’s movements and whispers secrets in her ear, is with her always—but invisible to the rest of the world. Lily has never told anyone about this shadow girl, and has come to accept Iris’ presence as a comforting constant in her otherwise isolated life.
But everything changes on the morning of Lily’s seventeenth birthday. Her father is killed in a terrible accident. Her mother sinks into a deep depression. And suddenly, Iris begins twisting herself more and more into Lily’s everyday life, possessing her thoughts and urging her to put together the pieces of a puzzle her father left behind. The only person Lily can confide in is Ty Collier, a mysterious boy who came to their small town in search of Lily’s father, and who seems to be harboring his own deep secrets.
As Lily searches for answers, she realizes that she and Iris are more intimately linked than she had ever imagined. Together, Lily and Ty must untangle a web of deception to discover the truth about the shadow girl’s past—and Lily’s own identity.