Return to the enchanting world of theMontague siblingsin the finale to the New York Times bestselling and Stonewall Honor-winning series, featuring a teenageAdrian Montagueas he desperately seeks the now adultMontyandFelicity—the older siblings he never knew he had.Adrian Montaguehas a bright future. The sole heir to his father’s estate, he is an up and coming political writer and engaged to an activist who challenges and inspires him. But most young Lords aren’t battling the debilitating anxietyAdriansecretly lives with, or the growing fear that it might consume him and all he hopes to accomplish. In the wake of his mother’s unexpected death,Adrianis also concerned people will find out that he has the mental illness she struggled with for years. When a newly found keepsake of hers—a piece of a broken spyglass—comes intoAdrian’s possession, he’s thrust into the past and finds himself face to face with an older brother he never knew he had.Henry “Monty” Montaguehas been living quietly in London for years, and his sudden appearance sendsAdrianon a quest to unravel family secrets that only the spyglass can answer. In pursuit of answers about the relic, the brothers chart a course to locate their sisterFelicity. But as they travel between the pirate courts of Rabat, Portuguese islands, the canals of Amsterdam, and into unknown Artic waters, theMontague siblingsare thrown into one final adventure as they face a ghostly legend that threatens their whole family.