Brought together by a mass shooting at a Texas county fair, children's book author and single mother Elle Portman and high-rolling corporate consultant Calder Hudson, both fueled by revenge, search for a killer while wondering if the attraction growing between them is too painful and complicated to sustain.

Who wouldn't want to live in a treehouse? Especially a 13-story treehouse that has a bowling alley, a see-through swimming pool, a tank full of sharks, a library full of comics, a secret underground laboratory, a games room, self-making beds, vines you can swing on, a vegetable vaporiser and a marshmallow machine that follows you around and automatically shoots your favourite flavoured marshmallows into your mouth whenever it discerns you're hungry....