Given that later on MacLaverty matured into the master he now is, perhaps we can forgive him for the way in which he chose to conclude "Cal", with a third-rate love story ending that makes one's toes curl in embarrassment.
The shame is that the first three-quarters of "Cal" is MacLaverty at his best, with the skill to let you, the reader, work out what's going on, rather than tell you. This could have been the great "novel of the Troubles" if he had spent more time on the ending, and been more courageous about finishing it.
If this is your first experience of MacLaverty don't be put off. Move on to his short stories, such as "Matters of Life and Death". He's become one of the best living writers, anywhere.