The demoness Lilith was defeated, and Jace was able to free herself from imprisonment. But when Shadowhunters come to his aid, they find nothing but blood and broken glass. In addition to his beloved Clary, another young man disappeared - Sebastian, the son of her father Valentine and her main enemy, who was called to do what his father failed to do - subordinate the team of Shadowhunters to his will. No matter what magic the Brotherhood used, not a single missing person can be found. However, Jace could not be long without Clary . When they meet again, the girl discovers that the dying magic Lilith has not left without a trace - Jace no longer looks like the one Clary loved. Now he is intimately connected with Sebastian, and, alas, Clary’s lover became what he feared most to be a faithful servant of Valentine’s evil will. The Brotherhood intends to destroy Sebastian, but it is impossible to do this without harming another. Will the Hunters kill one of their own?