Perfect! Rachel Joyce

Found myself in bed for the day with Rachel Joyce's new novel, Perfect. Okay, maybe I found myself in bed for the day *because* of Rachel Joyce's new novel, Perfect.

Here's GoodReads' blurb:  
In 1972, two seconds were added to time. It was in order to balance clock time with the movement of the earth. Byron Hemming knew this because James Lowe had told him and James was the cleverest boy at school. But how could time change? The steady movement of hands around a clock was as certain as their golden futures.Then Byron's mother, late for the school run, makes a devastating mistake. Byron's perfect world is shattered. Were those two extra seconds to blame? Can what follows ever be set right?

I loved last year's The Unlikely Pilgrimage of Harold Fry - and my high school students did too. Perfect is different but just as well-crafted and I'll be recommending Rachel Joyce to my students again.  While I'm loving the YA genre that targets our students, we must remember to encourage them to read across all genres and outside of their comfort zone.

QUESTION: What novels do you recommend for teenagers that fall out of the YA genre?