"Circus" is a fascinating fairy tale by Erin Morgenstern, which reveals the mysterious world of the "Nightmare" circus. In this magical place that appears only at night, incredible stories about love, loyalty, friendship and devotion will be told. The heroes of the book, it would seem, cannot save themselves from the enemy forces, and only fate decides their destinies. "Circus" is an exciting tale that reminds us of the importance of faith and trust in a world of magic and wonder.