Into the darkest corner by Elizabeth Haynes

If you liked Before I go to Sleep you'll love this. Catherine Bailey falls for Lee Brightman-hard. He is gorgeous, attentive has a mysterious job but there's no such thing as perfect as Catherine discovers to her cost. Fast forward three years. Cathy may have changed her name and location but Lee still haunts her. Cathy's rampant OCD is slowly coming under control and then with one phone call Lee is back and Cathy is convinced he can find her anywhere. He may already have done...