Ruthless Sinner (Zetas #6)
A.J. Adams

When dangerous, single-minded John Cooper learns his best friend was murdered, he resolves to exact bloody vengeance. The knowledge that his prey is a Zeta, one of Mexico's most dangerous cartels, doesn’t stop him. Coop joins the organisation, only to discover that finding his prey won't be easy. To his annoyance, sexy Spirit Westcott is also a spanner in the works. After embarrassing him in public, Coop suddenly finds himself saddled with her as an unwanted captive. Then, just as things couldn't get worse, a killer starts to pick off Beauview village girls. As Coop is drawn further into the cartel, he is forced to make decisions that may cost him his life–and that of his love.
Ruthless Sinner is a gripping tale of vengeance, murder, cartel violence and finding love in the darkest of times.
Warning: This bad boy romance contains explicit adult themes and graphic violence. It is for adults only.