Runaway. Sisters: Bound by Blood, #3

Her father sold her sisters. Now he's coming for her. Rena has spent her whole life hiding from the monster she calls her father. When a sleek black car pulls up to their broken-down house, she knows exactly what's about to happen-because she's seen it before. Jade. Savannah. She's next. One fight for her life. One knife. One terrible choice. Now she's running-alone, terrified, and determined to survive whatever comes next.
Four years later.Rena has reinvented herself in the only world brutal enough to match her pain: the illegal underground fighting circuit. They call her Tornado-a fierce, no-fear MMA fighter who never goes down. But when DEA officer Sean Donovan goes undercover to bust a violent fight club, she becomes the complication he didn't see coming. One right hook from her nearly breaks his jaw. One look from him nearly cracks her armor.
Sean wants her arrested. His captain wants her recruited. And Rena just wants to stay free. To take down a powerful drug lord obsessed with underground fighters, Rena must do the one thing she swore she'd never do: pretend to be Sean's lover and live with him 24/7. The danger is real. The chemistry is explosive. And the closer they get to the man they're hunting, the harder it becomes to tell what's an act.and what isn't.