New without plastic. No scratches on disk. See photos for more details. The Mystery of History Homeschool Companion Guide 2016 is a textbook written by Linda Lacour Hobar as part of the Mystery of History series. This guide is specifically designed for homeschooling students and covers a variety of educational subjects in an engaging and interactive format. With a focus on history and designed for intermediate level learners, this companion guide offers a comprehensive resource for those seeking to expand their knowledge and understanding of the subject.