The Red Scrolls of Magic

In "The Red Scrolls of Magic," the first book in the Eldest Curses series by Cassandra Clare and Wesley Chu, Magnus Bane seeks a romantic getaway in Europe with his boyfriend, Alec Lightwood. Their vacation takes a dramatic turn when they learn of a dangerous demon-worshipping cult called the Crimson Hand, allegedly founded by Magnus as a joke. Racing against time, the couple must navigate a web of danger and deception, relying on their trust in one another to confront the chaos unleashed by the cult.