Because You're Mine (Psychological Thriller)

Levin Crowdley is engaged to the man of her dreams, or so she thought. That is, until a stranger appears on her doorstep to suggest Alec, her adoring fiancé is anything but. No one has ever left Alec. More precisely; no one has ever left Alec and lived to tell about it.
Levin's life is now about survival, a game of cat and mouse as Alec pursues her.
And the second he catches her, he’s never letting go.
’Til death do them part.