In 1894, on the island of Samoa, a 44-year-old man making mayonnaise in his kitchen asked his wife whether his face looked strange, collapsed, and died within hours. This deep dive explores Robert Louis Stevenson as a reverse action hero: a frail, chronically ill child born into a dynasty of lighthouse engineers, whose confinement to a sickroom full of Calvinist terror and Scottish folktales became the crucible for Treasure Island, Kidnapped, and Dr. Jekyll and Mr. Hyde.

We follow his dodged engineering lectures, the velvet-jacketed bohemian phase, the secret club whose constitution rejected everything his parents taught, and the confession of atheism that devastated his family. Then we trace his near-fatal steerage and rail journey across America to chase Fanny Osbourne, the honeymoon in an abandoned silver mine, the bedridden Bournemouth years when he wrote his greatest adventures, his debates with Henry James about the purpose of fiction, and his final chapter in Samoa exposing colonial corruption in letters to the Times.

• Why modern diagnoses suggest bronchiectasis or sarcoidosis rather than tuberculosis
• His nurse Cummy and the childhood stories that shaped his Gothic imagination
• Playing the sedulous ape: how he learned prose by reverse-engineering great writers
• The leper colony at Molokai, the grand piano, and the name Tusitala
• His fall from critical favor under modernists like Virginia Woolf and his later reevaluation