The Devil's Bride by Contract

“Emma Carter never wanted a fairy tale - she just wanted her brother to live. A one-year contract marriage to quiet businessman Adrian Black seemed like the answer: fast money, no strings, no love required. But Adrian isn't who he says he is. When his father dies in a car crash that wasn't an accident, Emma finds herself standing between a dynasty at war and a husband who's suddenly the most hunted man alive. Every Black sibling wants the throne. Every one of them would kill to get it. And Emma - plain, ordinary Emma - has just become the only person Adrian trusts. She came for a paycheck. She's staying to survive. And somewhere between the lies and the loaded guns, she's falling for the one man she was never supposed to fall for.”