Hold up the Sky: The Sandman and the Darkest Night Series, 3 (Paperback) (ISBN-13: 9781732106031)

Twice Thompson Lee, Lily Conner and Carly Elise have fought the Ghlumms and won. Twice the girls have kept Earth safe from the dangers in the dark. But now comes a challenge no one could have foreseen--there is a tear in the sky, and if it isn't fixed, all could be lost. Join the three girls for an adventure that begins with the delight of exploration, and leads them to what lies beyond this world. New friends, new challenges, new risks, and the same three intrepid night travelers with their best friend, the Sandman.