For as long as she can remember, Megan Bradshaw has imagined herself as the heroine of Vindor, her own secret world populated with mermaids, centaurs, samurai, and more. When school pressures and an upcoming move make life unbearable, Megan wishes she could escape to Vindor for real. And then she does. Megan finds herself trapped in Vindor, with flesh-and-blood versions of her imaginary characters. Dreaming about being a hero and actually fighting monsters are two very different things-especially when the Shadow, the frightening creature now tearing Vindor apart, is one Megan doesn't remember putting there. Megan, playing the part of her alter ego, Selena, embarks on a dangerous journey, accompanied by a know-it-all centaur and a goblin she's not sure she can trust. Will the Shadow destroy her before she can find a way to save her world?