Headcase

Asa Mulvaney is half of a psychopathic whole who lives with his twin brother — together they party and kill, murder being the family business. When an experiment separates Asa and his brother, Asa is forced to navigate the world on his own for the first time in his life.

Zane Scott is a small-time crime blogger who dreams of a byline in a major paper, and his suspicions surrounding Thomas Mulvaney are about to make that dream a reality. When an invitation to a boring fundraiser lands him beside Asa instead of Thomas, they share an intensely passionate encounter that leaves Zane trapped in a cage of his own making.

Headcase is the fourth book in the Necessary Evils series, a high-heat, lovers-to-frenemies psychopath romance featuring an obsessive, calculating killer and a wannabe reporter, with gratuitous violence and very dark humor. Each book follows a different couple and can be read as a standalone.