I finished this one last night, Halley left behind her old life, she changed her name, moved to Northern NSW got married and has a teenage son. Then Aidan turns up the younger brother of her first love Dom and from there the story starts to unravel their lives. It's set partly during the troubles in Belfast and is a complex and tense book... I wrote a blog post on it https://mhmreadsandthings.wordpress.com/2017/05/09/the-cleanskin-by-laura-bloom/