In 1898 the British public thrilled to the tales of Louis de Rougemont, who claimed to have ridden giant sea turtles, dodged flying wombats, and been worshiped as a god across the uncharted Australian outback. In reality he was Henri Louis Grin, a Swiss-born failed footman, butler, and serial hustler who wrote his fantastical memoirs from the quiet reading room of the British Museum.

This deep dive unpacks one of history's most audacious identity thefts, a psychological portrait of Victorian gullibility and imperial fantasy. Grin anchored his fiction to real explorers, dodged the Royal Geographical Society with a corporate-style excuse, and, once exposed, embraced infamy as a touring attraction billed as the greatest liar on earth.

• How his years as an invisible servant fueled a craving for prestige
• The way magazine editor ...