Rushed

The woman is clearly suggesting from Stockholm Syndrome as well as being blindingly stupid. Someone tells her they're married, and she does nothing to try and find out if this is the truth? I appreciate that some women like rough, dominant sex, but this should be done through consent. What he did to her was rape. He degraded her every chance he got.
The dialogue was also very immature.
The plot felt rushed, and full of dead ends. Her father? Never mentioned again. Their marriage? No idea what happened. Her sister? God knows what happened there. Amanda? Just a random filler to show isabella and Sebastian's softer side. The detective? Dead-end.