The unexpected, thrilling and plain outright creepy all make up parts of the world, Jacquelyn Mitchard introduces us to in her book 'What We Saw at Night'.Allie Kim is a typical teenager with only one big different - she can't go out in sunlight because it will kill her. But, that doesn't stop her from going out at night with her two friends to play a high adrenalin, and life-threatening sport. On one of their night-time adventures, Allie witnesses something so spine-chilling that it causes nightmares. A glimpse of a girl who appears dead and a blond-haired man, who could be her killer. And that's when the fun really begins.When I first started reading this book, I thought I wasn't going to like it. The pace was slow and there was a little bit of info-dumping, which are two things that totally put me off a book. But, I continued reading because I had been given this for review through NetGalley. I was glad I did. It took awhile, but once the body had been discovered that was when the pace speed up and I ended up really enjoying the book. That's not to say that there weren't things that annoyed me about it. One of the things that bothered me was how Allie would call her mother 'Jack Jack'. Now, I don't know about you, but I would never in a million years get away with calling my mother anything, but 'Mom' or variations of the form. I know it was used affectionately, but it just didn't ring true to me and made them seem more like sisters than mother and daughter.I also didn't really like Juliet. She didn't think. Allie, her best friend, tried to tell her things that were only in her best interests and she pretty much manipulated the situation until Allie thought it was her. Juliet put her friends' lives in danger, totally on a whim of hers, all because she wanted to 'live'.The other characters were okay. I haven't really got anything to say about them. Rob played the love interest although I did think for a moment there was going to be some kind of love triangle going on, but it didn't happen. Rob was a follower. He followed Juliet and whatever she wanted to do. It was only later that he seem to become stronger as a character. I do think that Rob's relationship with Allie ended up being cute though, even if a little disappointing at times. I haven't really mentioned Allie as a character, because I don't really have much to say about her. She turned out to be quite a good character, even though, at times, I was a little disappointed in her.The story line itself was actually quite good. I liked how Allie and her friends weren't normal, everyday characters and that they had a condition they had to live with as best they could. I could understand why they did what they did when they decided to do Parkour. I also liked the murder-mystery side of it. It was better than the usual murder-mystery because Allie had a weakness that other heroines didn't have. The ending was kind of sad, especially since something happened that I didn't really expect. I should have, I guess, but I didn't.I would recommend this to readers who like murder-mystery novels.Now for my rating:-Three out of five starsThis review can be found here. http://magicalmanuscriptsandwritingthings.blogspot.co.nz/