Definitely reads more like a contemporary fiction, and I guessed almost all the twists. Most were quite obvious or tropey, but others were spoiled a page before the reveal, but over explaining. 
Also some of the reveals were so much build up for a fee pages of confrontation, so definitely could have done with a little less backstop, and a little more tension, hence the fiction vibes.
However I enjoyed! Easy to read, flew through it, and some darker topics were explored quite well I thought.