Herbert W. Armstrong (1892-1986) founded the Worldwide Church of God, Ambassador College and the Ambassador International Cultural Foundation. For over 50 years he was the editor in chief of The Plain Truth magazine, which was provided free of charge to the public. Mr. Armstrong visited more than 70 countries and was highly honored by heads of state in Japan, China, South Africa, Israel and Egypt. He was the author of The Missing Dimension in Sex, The Incredible Human Potential, The Wonderful World Tomorrow—What It Will Be Like, The United States and Britain in Prophecy, The Seven Laws of Success, and his Autobiography. At age 93, he released his final book, The Mystery of the Ages, which he considered to be his crowning achievement in life. Part I is a summary of his teachings about mankind's true destiny and the Kingdom of God. Part II reveals the identity of the lost ten tribes of Israel and their importance in end time prophecy. The Appendix gives a history of his church and explains why his teachings are suppressed by the very church he founded.