In 1953, a young man named Henry Molaison underwent experimental surgery to cure his epilepsy. The doctor removed his hippocampus. The seizures stopped, but so did time. For the rest of his life, Henry lived in a permanent present, his memory resetting every 30 seconds. He could meet you, shake your hand, and forget you before you sat down.

Known to science as "Patient H.M.," Henry became the most studied human brain in history. This book tells his poignant life story and how his tragedy proved that memory is not a single filing cabinet, but a complex network of systems. He couldn't remember doing a puzzle, yet his hands learned how to solve it—proving that the body remembers even when the mind forgets.