I am not a big reader of mystery novels, but something about this book really piqued my interest. April Henry is one of the few young adult mystery authors that I've heard of, but until The Girl Who Was Supposed to Die, I'd never picked up any of her books. I've heard a lot of good things about Henry's previous books, so I'm not quite sure this was the best one to start with as I wasn't completely blown away.The Girl Who Was Supposed to Die begins with our main character waking up to hear two men talking about killing her. She has no memory of who she is, what she's doing there or why this is happening to her. All she knows is she has to get out of there and fast. Her escape leads her into the arms of an surprising young man, who risks his own life to help her. Together they must discover the truth surrounding her situation and save those she loves most, before its too late.This book started off excellently. The reader will immediately be pulled into the story because of mystery of the main character. That being said, the development of the characters was seriously lacking. Even after the novel was finished, it didn't feel like I knew and understood the main character. In fact, all of the characters felt very one-dimensional, even the antagonists, which was disappointing. None of the characters were well-formed which ultimately means they are forgettable, even for the author it seems because some of them just dropped off the face of the planet. (Where'd ya go, James?) Plus the relationships were so awkward… I mean, the behavior of the MC's mom was atrocious and pretty unbelievable. And what person would risk their life over and over for someone they don't know? That didn't fit at all. There were ways that relationship could've been handled that wouldn't seem so fake.It's almost immediately obvious that this wasn't going to be a completely realistic story, but some of the twists made me raise a judgmental eyebrow. The setup of the story could've worked had the backgrounds of the characters been expanded and the twists not have been quite so condensed. The length was the main cause of the problems I had. The pace of the plot goes from zero to sixty in no time at all, which does the story no justice when it came to the story of the antagonists and their evil deeds. It really just seemed to get bizarre because the book takes a completely different turn than you'd expect. As for the things that I liked, the author's got a knack for suspense. It took all of my willpower not to skip forward to the end to find out the truth. Henry also has an excellent, descriptive prose. The fear the protagonist felt was almost palpable during much of the novel. That was a major plus. Henry's ability to project settings was fantastic as well. She's a great writer, really, she is. This novel just didn't show the full extent of her capabilities.The Girl Who Was Supposed to Die really is a thrilling story. It just lacked the depth that it really needed. So while it's an entertaining read, it's tame compared to what it could've been. Even though I wasn't completely satisfied, I plan to read more of her work in the future. The story wasn't perfect, but the suspense and thrills were very much present and that's why I enjoyed the novel as much as I did. If you are looking for a pretty short mystery, with very little depth, it's a high probability that you will love The Girl Who Was Supposed to Die.I received an ARC of this novel from the publisher for my honest opinion and review.This review can be seen here on my blog as well.