For over three decades, China exercised unprecedented control over the reproductive habits of its billion citizens. Now, with its economy faltering the government has brought an end to its one-child policy. Combining personal portraits of families affected by the policy with a nuanced account of the country’s descent towards economic and societal turmoil, Pulitzer Prize-winning journalist Mei Fong reveals the true cost of this most controversial of policies. Drawing on eight years spent documenting its repercussions, she reveals a dystopian legacy of second children refused documentation by the state. One Child humanises the policy that defined China and warns that the ill-effects of its legacy will be felt across the globe.