One of Cathy Duffy's 100 Top Picks for Homeschool Curriculum The Mystery of History provides a historically accurate, Bible-centered approach to learning ancient history. The completely chronological lessons shed new light on who walked the earth when, as well as on where important Bible figures fit into secular history. Volume 1 covers Creation to Resurrection, and Volume 2 covers the Early Church to the Middle Ages. This unique history curriculum was written for 4th-8th graders, but it is adaptable for both older and younger students.