Well, this was different. In a good way, of course. Most books that use mythology tend to stick with the Greek and Roman pantheon, instead this focuses on the Egyptian one. Let me just say that I love Ancient Egypt and it's mythology. I've been to Egypt, visited exhibits and so on so this was something I was eager to read.Sins of the Heart follows Dagan Krayle, the eldest son of Seth, the Egyptian god of chaos. All of his 4 sons are Darksoul reapers -they reap the souls of evildoers and feed them to their father who consumes their energy, preventing them from having any sort of afterlife and any chance at reincarnation, effectively destroying them completely.Dagan meets a 19 year old Roxy on a reap of a kidnapper and murderer. She's been kidnapped and is trying to escape. Dagan admires her courage and is tempted to release her though it goes against the rules when she sees him take the heart and soul he came for. He spots her necklace which is of the Daughters of Aset -the enemies of his father. He knows she isn't one of them yet but advises her to stay away from the unless she wants to become his enemy, and though she doesn't want that she feels she has no choice and joins them anyway.Eleven years later, one of Dagan's brother's has been killed. Seth is furious, he wants vengeance and his son's body so that he can resurrect him and find out who murdered him. Everything points to the Daughters of Aset and in Dagan's investigation he finds a necklace of a dead woman which matches Roxy's and prays she's not dead. He goes searching for her hoping she's leading the normal life he wished for her on the day he broke the rules and let her go free.There was a lot of world building in the first 200 pages or so which I appreciate but the romance did suffer a bit because of this. There was a brief scene between the Dae and Roxy where they met and then were reunited after those 200 pages so the romance had less time to blossom even though both Dae and Roxy were yearning for each other in the 11 years they were parted. The plot was solid and interesting though at times a little complicated with 6 or more POVs but I understand why all of these were necessary. The mystery behind which god is backing the destruction of Seth and his kin is a difficult one to guess at with so many different factors involved. This is a complex book which though confusing at times, I enjoyed. I will definitely be continuing the series very soon so I don't have time to forget anything. 3.5 stars.