From Alexandra Bracken, the #1 New York Times bestselling author of Lore, comes a stunningly original adult fantasy. Set in a sumptuous world ruled by magical perfume, this achingly romantic, slow-burn love story will shatter your heart and leave you breathless. Members of the ancient House Rosebourne have a strange gift born of a fairy the ability to infuse fragrance with magic capable of manipulating mind, body, and emotion. When a shocking murder leaves the kingdom of Albion vulnerable to a coup, royal spymaster Hugh Thornton seeks the one person who can Viola Lockhart, the last living Rosebourne and secret heir to a fraught legacy. Livid at the silver-eyed aristocrat who had her thrown in jail to force her compliance, Viola nevertheless comes to an agreement with him. In exchange for crafting Immortal Rose, the singular perfume capable of saving Albion, illegitimate Viola can seize the life—and fortune—that should have been hers. As Hugh and Viola race to find the perfume’s lost fairy ingredient, hidden deep in Albion’s dark underbelly, neither can deny the scorching attraction building between them—especially as the attempts on Viola’s life grow increasingly brazen. But a terrible truth lurks in the heart notes of their kingdom—and while every bargain has a cost, Immortal Rose may demand more than Hugh and Viola can ever pay.