The Black Dagger Brotherhood is a series of paranormal romance novels written by J.R. Ward. The story revolves around a group of vampire warriors who protect their race from the threat of lessers, evil beings that hunt vampires. Each book typically focuses on a different brother's journey, exploring themes of love, loyalty, and sacrifice. Set in a fictional version of Caldwell, New York, the series features a rich mythology and a diverse cast of characters, including the brothers themselves and their romantic interests. The novels blend action, romance, and supernatural elements, appealing to fans of both romance and fantasy genres.