Lots of kids have imaginary friends, but Kate had an entire imaginary world to visit when she was a girl. When she keeps insisting that her friends are real, she ends up in an institution, where she is forced to put that part of her life behind her. Shortly after Kate turns eighteen and leaves Bayshore Psychiatric to start a normal life, her old friend Cor returns, transformed from the boy she loved into a handsome but guarded stranger. His world is darker than the fun and games she remembers from childhood and he warns her that the monsters there can hunt her now that she lives on her own. If she’ll come back to his world long enough to learn the magic she needs to defend herself, he’ll agree to stay out of her life. He’s only imaginary, but it gets harder and harder for Kate to think of saying goodbye.