Pretty decent. I could kinda tell it was the author's first book, though. Characters often get introduced w/o sufficient description, and there wasn't enough exposition at the very beginning to orient the reader at all. Fortunately, things become clearer as you go along. Although I can't say the twists at the end were particularly surprising. Also, it's hard to fear for the protagonist's life when the book is written in 1st person. But I'd read the sequel.