In 1939 the influential architect Berthold Lubetkin abruptly left his thriving career in London and dropped out of sight, moving with his wife to a desolate farm in rural Gloucestershire. Life in the house the Lubetkins named “World’s End” was far from idyllic for their three children. Louise Kehoe and her siblings lived in an atmosphere of oppressive isolation, while their tyrannical father—at times charming and witty but usually a terrorist in a self-styled Stalinist hell—badgered and belittled them during his fits of self-loathing. Even his true identity remained an enigma. That secret was never divulged during her father’s lifetime, but Louise’s quest to unearth its tragic origins—her relentless piecing together of the clues she found after his death—is a remarkable story, written with extraordinary grace, style, and imagination, of an identity and a heritage lost and found.