The Heretic's Daughter, by Kathleen Kent. Little, Brown and Co., 2008.

Ten-year old Sarah Carrier is both an observer and participant in the events leading to the witch trials in Salem, Massachusetts, and the story reveals itself from her point of view - fuzzy on the politics and implications of the historical period described, but full of details about the daily life and hardships of the families making new lives in the New World. And as the tension mounts towards the end of the novel and Sarah's mother is hanged as a witch, you have to piece things together carefully to figure out who the real "heretic" is.