Erin Beaty tells a unique YA genre-blending story in Blood and Moonlight, mixing fantasy and romance into a serial killer mystery. Catrin works for an architect at the Sanctum, and one night while out checking the scaffolding she hears a murder being committed - and the victim makes her boss, Magister Thomas, look like a strong suspect. Catrin decides to lend her testimony and her services to Simon, who is tasked with investigating the murder when his own cousin, Oudin, is a suspect as well. Catrin quickly bonds with Simon, and takes to his other cousins Juliane and Lambert as well. But not only is she hiding Magister Thomas' potential involvement from Simon, she's hiding extra-sensory abilities she's discovered come out with the moonlight, something that ties her to the hated Selenae community. As the murders hit closer and closer to home for Catrin and her new friends, her relationship with Simon threatens to fall apart, and may make it to late to save the people she cares about the most from the murderer. I really like how Beaty has written a young adult novel that has elements of fantasy and mystery, and it is a standalone novel. Catrin's abilities do help her contribute to solving the murders, but it feels like this storyline could be stronger in the novel. I also feel like for as smart as Simon is, and the abilities that Catrin has, that the ending is weak. They swing back and forth between three different people as the murderer, jumping from one to another, and then back again. Some people may regard this as great plot twists, but to me it was more exhausting and indicative that Simon and Catrin didn't do as good of a job narrowing down their suspects. It also lends a frenzied pace to the end of the book that stands in stark contrast to a much slower pace set investigating the murders throughout the rest of the story. I enjoyed this, but would have like to have seen an investigation that seems more cohesive. A copy of this book was provided by the publisher via BookishFirst in exchange for a fair and honest review.