Thank you netgalley for the eARC in exchange for an honest review. Heir of Sin is the first in a Romantasy series based on djinns of the seven deadly sins. This book followed Keira getting to know Elijah, the djinn of Lust, awakening a new side of her.
Overall I enjoyed the book however I struggled with a few things that are personal preference as opposed to things specifically wrong with the book.
Firstly, I prefer my Romantasy books to be 1st person, especially dual POV, so I struggled to connect with Keira and be fully invested in her getting to know Elijah and fall for him. I always struggle more with 3rd person romances and found that I didn't really see why Elijah fell for Keira so quickly and equally why she did for him, apart from the obvious lust element.
I also tend to read spicier Romantasy books so, although there was some spice, it wasn't particularly spicy for me. I liked the idea of Keira getting to know herself and her own sexuality but I did struggle with a few elements of it,

in particular regarding something that happened at the end which blurred the lines a bit with Keira's manipulation of Elijah -

that definitely put me off her quite a bit.
That being said, it is an enjoyable story and I'm sure many Romantasy fans will enjoy Heir of Sin and want to continue with the story; unfortunately it just didn't connect with me.