Brings to light 12 of history's secret groups including The Knights Templar whose purpose was to protect travelers to holy sites after the Crusades; The Freemasons, one of the world's oldest secret societies that performs charity work; The Molly Maguires who began in Ireland in the 1840s as a secret society that stood up against landlords and bosses who treated them poorly; and more. The book features historic photos, interesting sidebars, and thought-provoking prompts.