From School Library Journal

Grade 8 Up–In the two previous books, Clary learns that she is a member of a race of demon-hunters and that she has the special ability to create new versions of the runes that give these Shadowhunters their power. Her mother has been hiding the truth from her for years to protect her from her father, Valentine, a cult-leader-turned-villain who is seeking to gain control over the Shadowhunters by obtaining the three Mortal Instruments. Now, Valentine has only one Mortal Instrument left to find, and the Shadowhunters must ally with the despised Downworlders, including vampires, werewolves, and fairies, to prepare their final defense. The question of whether Clary will be able to harness her unique abilities in time to help–and whether they will let her–is sidelined by the question of whether her love interest, Jace, is really her brother. Though the story is hampered by predictability and overblown writing, Clare continues her talent for mixing hip, modern humor with traditional fantasy, and fans eagerly awaiting the series conclusion should come away more than satisfied.–Eliza Langhans, Hatfield Public Library, MA
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From Booklist

In search of a potion for her dying mother, Clary sneaks into the City of Glass and is immediately caught up in a life-and-death battle. As the children of the Moon (werewolves), Night (vampires), and Faerie gather for a war that will rend the heavens, Clary calls upon her untrained powers to control an angel who will save or destroy them all. Readers should be familiar with the first two installments in the Mortal Instruments series, but there is nevertheless plenty of romance, loss, honor, and betrayal to make the journey worthwhile. An experienced storyteller, Clare moves the plot quickly to a satisfying end. Grades 8-11. --Cindy Welch