Domino Effect. Sinners

Brian is an employee of the National Security Agency, embedded in a California crime syndicate for three years. Any member of the mafia family must undergo a loyalty test sooner or later, and the clan leader assigns him the task of killing his rival's daughter. Only this girl turns out to be Cassandra, Brian's first love, who betrayed him eight years ago.
And he has only two options: sabotage the entire operation to save her life or destroy her, just as she once did to him.