I was surprised by how hilarious I thought this book was. Very witty and sarcastic, but usually not overtly so. I'm not sure how that will translate into the second book (if I'll get tired of the voice), but it worked well here. There were some parts that I felt were rushed or not explained too well, but I was willing to go along with the ride. Toby's attitude and voice literally made me laugh out loud more than once. It's not as "young" as some other spy novels like the Gallagher Girls series (more references to bullet-proof bras, butt photocopying, some swearing, etc.) so I probably won't be giving it to my niece for a few years yet, but it's pretty tame in most respects, at least compared to a lot of the YA books on the market.There are some loose ends that are obviously meant to pick up in book two. From what I could gather, there's only two books in the series, but the second one leaves off rather abruptly too (as if the author wanted to write a third but the publisher didn't end up picking it up), so I'll probably give it a shot to at least see if it's as funny as the first.