The man who built the most innocent sanctuary in children's literature, the Hundred Acre Wood, ended up trapped by it. That same little yellow bear fractured his family and led to a permanent, heartbreaking estrangement from his real-life son.

This episode looks far beyond the bear to reveal A.A. Milne as a fiercely intellectual playwright, World War I propagandist, and serious adult author who became a hostage to his own accidental masterpiece. We unpack the staggering gap between the idyllic forest and the people swallowed whole by its success.

• His life as a prodigy and West End playwright who played cricket alongside J.M. Barrie and Arthur Conan Doyle
• His service on the Somme and his work writing propaganda for military intelligence unit MI7B
• How just 70,000 words across four books, written from 1924 to 1928, o ...