What a fantastic thriller! Fast-paced, creepy, tense! 

A group of women attend the same fitness centre classes. They are friendly to each other and sometimes even meet outside of workouts. Nothing sinister there, right? Wrong! It's kind of crazy how it made me think of the ladies from my classes, and I'm hoping I never did anything to any of them!

The characters are complicated. Nothing is as it seems, and even though I have guessed some of the story, the biggest parts were huge plot twists I would have never expected.
Fascinating how Alex kept so many storylines so engaging, how the mysteries at first unconnected made a whole story and how calculated the movements were! 

Intrigue, the plotting, and the writing itself - absolutely brilliant.

It's definitely one of the best books I've read this year and I can't wait to read more by the author.