Eve of Darkness was good - I liked it, but I felt like there was too much going on to keep track of everything. It seemed like Eve just kept taking hits without a break to recover. The book starts out with a bang - Evangeline Hollis (Eve) is at a baseball game and ends up battling a dragon in the ladies' room. Then, it flashes back six weeks and Eve is headed to a job interview, sees this hot guy who reminds her of her first love, Alec Cain, and has sex with the guy in the stairwell. He then reaches out and "marks" her with a brand on her arm - the Mark of Cain. She thinks she is hallucinating and goes home. There, Cain is waiting for her and tells her she was marked by his brother, Reed Abel (yes, THAT Cain and Abel) and is now a "demon killer" for God. She doesn't want to believe it and doesn't want to believe Cain is back in her life after 10 years, but once she goes through the transition she knows it's true. If I understand everyone's positions correctly, Cain is her mentor/teacher, and Abel is their boss. This book had a lot of storylines going on at once: A water demon was attacking her repeatedly, a group of tengu (sort of like small gargoyles), and werewolves; it's a lot, but Ms. Day ties everything up neatly at the end. Eve's main problem is that the demons she's supposed to be slaying are not marked nor do they smell (all demons are marked to show where they fall in the demon hierarchy and smell bad). She needs to find out why not and how to stop it.
This book lays good groundwork for Eve's "world". The Angel/Mark heirarchy is very interesting, as well as the Demon system. Eve is agnostic, which also makes things very interesting for her. I liked the three main characters as well as the secondary characters - the angels, Eve's family, her neighbor and a mysterious priest. There is a sexual tension that runs throughout the book between Eve and Cain and Eve and Abel. Cain and Abel's hatred for each other is well-written.