A burnt-out nurse takes a nanny job for one of Chicago's wealthiest men. Later she finds out he's the ruthless Pakhan of the Fedorov Bratva.
Tension and attacks from an unknown rival thrust Sierra Jacobs into the world of Mikhail Fedorov. Growing close with his two daughters while trying to maintain professional boundaries, she struggles as feelings grow.
Mikhail tries to stay away from his daughters' nanny but he quickly starts to fall for Sierra. After he sees just how capable she is at protecting them, Mikhail struggles to not imagine her as his new queen.