The Wizard (Novel)

"Fortunately, the mystery is engaging, and the aforementioned found-family element of the book is strong. Cheng Jinxi has a good reason for everything he's done, and that all goes back to the Cheng family's magical bloodline. Jinxi is the current bearer of the supernatural gifts, but he's not content to let the Cheng family dictate how he uses them – in fact, everything he does is in the interest of protecting his niece, Nie Yongshu. Her parents (his sister and brother-in-law) were killed, kicking off the entire series of events, and Cheng Jinxi's reason for being is to keep his Yongshu safe from the family's magic powers and those who would use her for their own benefit. He, Yongshu, and Yuangfeng eventually form a family unit, and the scenes with the three of them settling into a warm and caring life are some of the strongest in the book."
-Rebecca Silverman, Anime News Network