This was a really entertaining book and a unique take on the Fates (otherwise known as Moirai from Greek mythology). The worldbuilding was solid and interesting enough to really grab me from the beginning, and even though some developments seemed very "convenient" to say the least, I can honestly say that I had fun reading this one. 
 The story is told in dual third person perspective, alternating between the point of view of Corinthe and Lucas. 
 Corinthe is one of the sister Fates. She's been exiled from Pyralis for being "too eager, too curious, too questioning". And she can't go back until the Unseen Ones permit it. She and her sisters keep the universe in balance by making sure that all destinies are fulfilled - "most destinies would be fulfilled on their own, but the clouded marbles, the damaged ones that she and her sister Fates gathered, needed extra attention." Corinthe is now an Executor and her job on Earth is carrying out unfulfilled destinies. She lives among humans, blending in and pretending to be one of them. 
 It had been ten years since Corinthe's exile as an Executor, ten years of completing assignments, and now it's finally time for her to return home. She has one last job to do and then she can go back to Pyralis. Only this job will prove to be the hardest of all. To live, she will have to kill the one she loves. And what she doesn't yet know is that there's a lot more at stake than just her and the boy's destiny. 
 Now, if you're familiar with the Fates from Greek mythology, you know that they were three sisters: Clotho (spinner), Lachesis (allotter) and Atropos (unturnable). You also know that they controlled the metaphorical thread of life of every mortal (possibly even Gods). The Fates is this book, though, are a bit different. First of all, there are more than just three (though we only get to meet one, Corinthe). And second, their "jobs" are different. While Clotho, Lachesis and Atropos each had a specific "job" to do - one was responsible for birth, one for the length of life, and one for death - The Fates we meet in this story deal with destinies, making sure that everything goes smoothly and according to the "big plan". They intervene when their help is needed, they make people fall in love or break up, they cause seemingly accidental deaths, etc. In other words, they're like puppet masters I guess. I kind of liked that concept, though I wish we'd get to meet the other sisters, too. In a way, we only got to explore one side of the story. We met Corinthe and her guardian, Miranda, and we learned everything about Pyralis, the Unseen Ones, the Tribunal and the Radicals from them. We know what Miranda's take on the whole *predetermined fate* was, but we didn't get to meet a character that would explain/argue the other point of view. I thought that would've made the story more three-dimensional. Additionally, I really wanted to learn more about the Unseen Ones and the Tribunal. 
 I liked both the lead characters - Lucas a little bit more than Corinthe - but I can't say that I felt a strong connection to them. I didn't find their story particularly emotionally engaging, or their relationship convincing enough. Their strong attraction to one another felt rushed, even odd at times. Consequently, while I wanted to find out how their story ended, I wasn't very invested in it all. I did, however, really enjoy the passages describing Corinthe's first experiences on Earth, how she perceived this "foreign, terrible world full of obscene noises and blasts of light" (Pyralis is more like a calm and pure oasis compared to Humana), and how she slowly adapted. She seemed lost at first - terrified even - but being a strong and resourceful girl, she learned to face her fears and overcome obstacles. And, inevitably, she became more and more human with each passing day. 
 Luc was described as a regular run-of-the-mill kind of guy. Not stupid, but not particularly clever either. He lives in a small apartment with his sister and dad, isn't especially popular at school and his only talent is being good at soccer. His girlfriend, on the other hand, is a very popular and rich hottie who lives in a glamorous mansion with live-in housekeepers. She's smart, talented and beautiful. Lucas' family is slowly falling apart - with his dad hitting the bottle again and his sister doing drugs at the age of 15 - while Karen's family is picture perfect. Needless to say, they're worlds apart. He knows he is extremely lucky to be with a girl like that, and yet something is missing. 
 I really loved Lucas' devotion to his younger sister. He really loves her and cares for her, and it kills him to see her fall apart in front of his eyes and not be able to do anything about it. He is a good guy with lots of baggage and little hope, but he stays strong and does everything to keep the pieces of their fractured family life together. He's very selfless and caring. I really admired that about him. 
 Like I said before, the world building in Fates is on a decent level. There are two main realms in this book; two worlds - Pyralis and Humana (Earth). There are also other interesting dimensions, filled with intriguing, magical creatures (such as the blood thirsty Blood Nymphs). The part of of the world building dedicated to these dimensions was intricate and breathtaking, even if a little bit over the top at times. I loved the mythology, especially the fact that so much of it was eerie and dangerous. Some passages - particularly those describing how Blood Nymphs were made - were downright bone-chilling and disturbing. Sick, even! 
 Free will vs predetermined fate. The power struggle between The Tribunal, the Unseen Ones and the Radicals. Convoluted yet intriguing political games, backstabbings and deception. Ambition and revenge. Manipulation and seeds of destruction. Love and death. Fates has it all and more! If you enjoy books built around mythological concepts, magical settings and characters, and plot lines filled with adventure and drama, you will love this one!