I liked this book, but everything felt a little too quirky this time around. Like there are no "normal" characters that I can remember (except maybe Safer's mom and even she was a little weird). Some readers might find that annoying.
I liked the story though. The twist felt abrupt to me, but about halfway through I kind of remembered that a twist was coming, so I think that was just my own brain sabotaging my rereading.
Liar & Spy is not my favorite Stead (I mean, she'll have to work really hard to top When You Reach Me), but if you're a fan of her other books you'll probably like this one too.