Instruct: Classify an Amazon review into positive or negative sentiment.
Query: an excellent mystery

Linda Hall is truly a gifted mystery writer. Margaret returns to her family home to escape a failing marriage and emptiness after her daughter's death. However, instead of a haven, she finds that she must come face to face with her sister's mysterious death twenty-five years before. Her estranged family of aunts, uncles, and cousins all seem to be keeping secrets from her, as do the retarded man and his crazy mother who live next door. On top of this, Margaret also comes across a one-hundred-year-old legend that includes a curse on her house and a ghost who walks the beach at night. Before Margaret can find her peace, she must find her answers. Did her sister die accidentally, as she had been lead to believe? Is her house cursed? Who has been watching her and why? Did God desert her when her daughter died? Hall is excellent at writing multilayered mysteries, and Margaret's Peace is no exception. I could not put it down.