<p> This book explores representations of girlhood and young womanhood in recent English language children's fantasy by focusing on two fantastic body transformation types: invisibility and age-shifting. Drawing on recent feminist and queer theory the study discusses the tropes of invisibility and age-shifting as narrative devices representing gendered experiences. The transformations offer various perspectives on a girl's changing body and identity and provide links between real-life and fantastic discourses of gender power invisibility and aging.</p><p> The main focus is on English-language fantasy published since the 1970s but the motifs of invisibility and age-shifting in earlier tales and children's books is reviewed; this is the first study of children's fantasy literature that considers these tropes at length.</p><p> Novels discussed are from both critically acclaimed authors and the less well known. Most of the novels depicting invisible or age-shifting girls are neither thoroughly conventional nor radically subversive but present a range of styles. In terms of gender children's fantasy novels can be more complex than they are often interpreted to be.</p>