Dakiti: Ziva Payvan Book 1. Ziva Payvan, #1

The distant world of Haphez is located on the edge of populated space. The planet's native superhuman race is feared and respected by neighboring civilizations. Their military and police forces are unmatched. Lieutenant Aroska Tarbic is an agent with the revered Haphezian Special Police. He's lost a lot in a short period of time; the other members of his squad were killed in a tragic accident, and his younger brother was wrongfully convicted and executed for a crime he didn't commit.
Just when Aroska thinks he's starting to piece his life back together, he's assigned to a joint task force with a special operations team. It seems like a unique opportunity, at least until he learns his new commander is none other than Ziva Payvan, HSP's finest operative.and the assassin who killed his brother. Ziva is good at her job, a business that requires her to ignore her feelings and carry out her missions without question.
She's confident in her own abilities to complete the assignment, but Aroska is a wildcard. When their team stumbles across a young human during a routine investigation, they soon realize the situation isn't what it seems. The boy has unwittingly uncovered a sinister plot, one that could put the entire Haphezian race in jeopardy. Now the lines between friend and foe have become blurred, and no one can be trusted.
United by the imminent threat, Ziva and Aroska must set their differences aside long enough to save their people.and maybe even each other.