Five Hundred Miles From You

Lissa loves her job as a nurse, but recently she's been doing a better job of looking after other people than looking after herself. After a traumatic incident at work leaves her feeling overwhelmed, she agrees to swap lives with someone in a quiet village in Scotland.
Cormac is restless. Just out of the army, he's desperately in need of distraction, and there's precious little of it in Kirrinfief. Maybe three months in London is just what he needs.
As Lissa and Cormac warm to their new lives, emailing back and forth about anything and everything, finally things seem to be falling into place. But each of them feel there's still a piece missing. What - or who - could it be?