Mortal Sins by Eileen Wilks

Mortal Sins:
FBI agent Lily Yu is in North Carolina with her lover and mate Rule Turner, lu nuncio of the Nokolai werewolf clan, where he is to take custody of his son from the boy’s grandmother. It’s a purely personal trip until Rule, in wolf form, finds three bodies in a shallow grave. They carry the stench of DEATH MAGIC, which makes the murders a federal crime. Lily takes charge of the investigation, and soon realizes that nothing adds up—not the motives, not even the accused killer, who’s behind bars when death strikes again.

But murder, however bizarre, is an everyday affair for Lily, who was a homicide cop before being recruited into the FBI’s Magical Crimes Division. A more personal shock arrives in the person of Rule’s son’s mother. Why is she challenging Rule’s long standing plan to bring his son to live among the Nokolai?

But family must take a back seat when the violence escalates, and there’s no rhyme or reason for the killer’s next strike—a killer who may not even be of this world...

The intricate and dangerous world of the lupi that Eileen Wilks created draws me in with each new addition. Not only do these books have a paranormal element but they are also crime-fiction styled, filled with mystery and murder. In Eileen's world, magic has become a regular part of life, and werewolves--or the more political term lupi--are living among humans. While discrimination is still a problem, things are slowly getting better for Lily and Rule, and others who have magical Gifts. Rule is a true, sexy alpha male and the heir to his clan and leader among his people. Lily is a tough-as-nails FBI agent in a special unit dedicated to magical crimes. New laws come into play when events of the past effect current events partly due to when more magic was released and the world begins to change. The romance and sexual tension keeps you interested, but it's the promise of solving the crime that keeps me turning pages. Eileen's characters are so incredible, even the secondary ones stick with you long after you have put the book down.