This is the first book in the series that I read, and it works as a standalone. The world-building is great, the whole idea about the Kar'Kal and their home planet is so intriguing that I will definitely read the entire series. The main characters clicked well together; he was a such sweet guy, and she was not afraid to go after what she wanted. Their sexy times were scorching hot! The book made me laugh as well, the subtle humor was so good. 5-star science fiction romance!