Mated To The Big Bad Alpha

Imagine being sent to kill the most ‘unkillable’ man in the underworld—The Big Bad Alpha.
If you fail, he kills you without mercy. And everyone else who ever tried failed. How then can you, a lone female assassin, kill this monster?
You decide to do it against all odds but when you get there, BOOM! The deadliest Alpha alive is your mate.
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Wayne Knight stepped into the room and Olive's heart thudded loudly. He was the most powerful Alpha in the country, and she was sent to assassinate him. But she failed and was caught, which meant he would not have any mercy on her. He was going to kill her mercilessly and ruthlessly.
But why was she loving the scent of him since he stepped into the room?
Why did she love his gaze on her despite being scared?
And why was he not breaking his eye contact with her ever since he entered the room?
Well, her wolf growled her the answer to all her questions...“MATE.”