The Perfect Wife

When Abbie Cullen met Tim Scott, she was a struggling artist and he was the brilliant British cofounder of one of Silicon Valley's most successful start-ups. 

Within six months, they were married. But when she promised him in her wedding vows that she would love him forever, she had no idea just how literally he would take it....

This is a thriller with an element of sci fi included. The surprises in the plot start almost immediately and it keeps the reader guessing throughout. We're never quite sure of the motivations of Abbie and Tim and this adds greatly to the suspense.