Sarah would give anything to regain the power and wealth her family lost, so she makes a deal with Azrael, Lord of Darkwater Hall. He gives her a chance to accomplish her objective, providing the time and the means, all in exchange for her soul. Fast-forward one hundred years to Tom, a young boy who dreams of going to Darkwater Hall School but doesn't believe he has the talent. Until he meets the new professor, Azrael, who offers him a bargain. Will Sarah somehow be able to stop Tom from making the same mistakes she did?Darkwater is rather dark and mysterious, an exploration into the price of knowledge and the value of the soul. The book is two stories about two characters, two lessons that could lead to the same horrible outcome.Both Sarah and Tom have their similarities, but they're not the same character. Sarah's on a mission to restore her family's former glory and Tom wants to find a place of his own in his small town and move on from the bullies while figuring out the odd situation his brother is in. Unfortunately for the book, I was far more interested in Sarah's story than Tom's.Perhaps the biggest question in the book is who is Azrael. No one really knows what he's after. He's looking for someone to help him find something. That something is possibly scientific and almost definitely impossible, but that doesn't stop him. Anything can be discovered, given enough time.The book takes place in two time periods giving it both a historical feel and a present day feel. Again, since I preferred Sarah over Tom, I preferred the historical setting more, but the present day setting felt more complicated. This is possibly due to every important character being there: Sarah, Tom, Tom's brother, and Azrael.What is the price of knowledge and power? What must be sacrificed to have one of the other, or both? Would you sacrifice your own soul?