From the Wall Street Journal bestselling author of The Paper Magician Series comes the enthralling climax of a cataclysmic war between monstrous creatures.

Sandis has finally freed herself from her master and his plans to use her as a vessel for the ancient beast Kolosos. But her master has found a new, impossible vessel: Sandis’s brother, Anon—a brother she long thought dead.

Kolosos is ancient, massive, and seemingly unbeatable. Fortunately, Sandis has her own monster—an ethereal fire horse that she can summon at will. In addition, she and Rone may have discovered the secret to defeating Kolosos: ancient lore that details the creation of magic. It could be the key to victory and the key to saving Anon.

The price is steep, and Sandis is willing to pay it. Rone is not, and his attempt to save her only pulls them apart. As both are tested in ways they never expected, Sandis and Rone will need to determine the sacrifices they are willing to make. If their efforts are not enough, their city will fall…just as the ancient city beneath it already has.

Charlie N. Holmberg is the author of Smoke and Summons, Myths and Mortals, and Siege and Sacrifice in the Numina Series. Her Wall Street Journal bestselling Paper Magician Series, which includes The Paper Magician, The Glass Magician, and The Master Magician, has been optioned by the Walt Disney Company. Charlie’s stand-alone novel, Followed by Frost, was nominated for a 2016 RITA Award for Best Young Adult Romance. Born in Salt Lake City, Charlie was raised a Trekkie alongside three sisters who also have boy names. She is a proud BYU alumna, plays the ukulele, owns too many pairs of glasses, and finally adopted a dog. She currently lives with her family in Utah. Visit her at www.charlienholmberg.com.