Magic 16 Twins 13 Brothers and sisters 12 Characters in literature 12 Fairy tales 12 Youths' writings 12 Quests (Expeditions) 2 Death 1 Demonology 1 Fantasy 1 Friendship 1 Hotels 1 Identity 1 Identity (Psychology) 1 Imaginary places 1 Investigation 1 Love 1 Missing children 1 Monsters 1 Murder 1 Princes 1 Secrecy 1 Secrets 1 Serial murderers 1 Sisters 1 Teenagers 1 Twin sisters 1 Witches 1 Young adult fiction, English 1