The Mathematics of Guilt

298 pp. Brown boards with red text on spine and front board. Ostrander is considered a possible inventor of the "blind detective" trope, and Agatha Christie parodied her in Partners in Crime. In this gripping tale of mystery and adventure, the author records the life of an orphan who is adopted by a middle aged banker. The foster father educates the child, watches his growth and development with a jealous eye and finally gives even his personal honor into the young man's keeping. Is the trust misplaced' Does the orphan's career justify such extreme confidence' You will find the answer in Miss Ostrander's fascinating research into the very mathematics of guilt.