The beginning was kind of slow, though not frustratingly so. The book started picking up about 20% ago, which is a good thing, but the progress is still kind of lazy. Fortunately we are starting to see some reveals of possible mysteries and secrets that give you a kind of chill (what kinds of mad scientist, creepy lab secrets wouldn't?).
This isn't the best book in the world, so far, but I'm not too bothered by it to enjoy it.