A year ago, vampire Sophronia Vega changed the world with a dating app. A vampire-human dating app, to be specific. After a century of coexistence and potentially dangerous intimacy, humans and vampires who want to hook up can now take a simple test and use her app, Stokr, to find out immediately whether “safe direct feeding” is possible between them. Unfortunately, just as she’s ready to celebrate its success, the app unexpectedly starts failing and puts all its users in danger. With years of painstakingly perfect plans destroyed in an instant, Sophronia frantically starts trying to figure out what happened with the help of human Casey Amato, the universally adored manager of the tech team that programmed Stokr—who just so happens to smell like “heaven in a glass,” from a vampire’s perspective. Though Sophronia is technically Casey’s boss, and they quickly come to realize the issues with Stokr go much deeper than either could have imagined, even their intense investigation isn’t enough to keep them from thinking about each other—but until they fix the app, there’s no way for them to act on their attraction. Vasti is new to the vampire world, but not to HEAs; she’s well known for her witty historical romances. Fans of her earlier work will find much to like about this first book in her Corporate Bloodsuckers duology, as clever banter, fun side characters, and steamy scenes work just as well in vampire-led boardrooms as in Regency ballrooms. Though the story is technically a slow burn, it has strong insta-love vibes, which won’t work for all readers. But Vasti’s sexy take on vampire-human attraction and the interesting, complex plot—especially a cliffhanger setup for the next book—will keep readers turning pages.