Other than the very good writing of the werewolves transformation I didn't like this at all. it would have appeal to some, so don't take my word for it. 
 the main story of the murder of mac's best friend is a huge rip off of Veronica mars. which I loved! the show, not this. the similarities don't stop there, she starts liking the dead friends boyfriend & the dead friend secretly dated the town criminal. there are others I just don't have the time. It's like the author watched the show and took notes for her book. nothing is truly original anymore, but we the readers do appreciate the effort. 
 that aside it was predictable from the first mention of the fiend, I knew who done it. which is sad in a murder mystery.