Readers familiar with Afghanistan’s Great Game will appreciate this version of an unfolding catastrophe. History buffs and espionage fans will be fascinated with Richardson’s cast of characters, which included Victorian megalomaniacs, Afghan princes, Russian adventurers, and corrupt East India employees. Masson seemed consigned to obscurity, but today his discoveries are collected and cataloged at the British Museum and the British Library. Richardson’s biography, of a man who burned with the fire of discovery, completes his story.