A dead woman's invitation. A weaponized threshold. The final door. A vampire can't enter a home uninvited. It's the one rule Lena Sloane has never had to question. Until she steps across a threshold that shouldn't let her in, and finds an underground network has learned to store, inherit, and manipulate permission itself. Evelyn Calder believes her late mother left behind a route to "Outside," an archive that could expose the entire network. Finding it means putting Owen through a seventy-year-old hospital bracelet and whatever memory it's still carrying. Everyone wants the archive, for different reasons. With a network operator hunting them to protect his infrastructure and an ancient vampire desperate to bury her own history, Lena, Priya, and Owen have to figure out who actually gets to own permission before the last door closes.
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