Clockwork Angel The Infernal Devices Book 1 Paperback city of bones Clockwork Angel by Cassandra Clare, the first installment in The Infernal Devices trilogy, serves as a prequel to The Mortal Instruments series. This young adult fantasy novel follows Tessa Gray as she enters the Victorian London Downworld, discovering her own unique powers while becoming entangled with the Shadowhunters. This edition includes bonus content featuring the original story "Magnus's Vow." Published by Margaret K. McElderry Books, this paperback is a must-have for fans of paranormal romance and steampunk-inspired urban fantasy.