In 1918-19 an influenza pandemic took an estimated 15,000 Australian lives, and millions more around the world. One hundred years on, as we grapple with COVID-19, this five-part series rakes through the archives of the State Library of NSW with historians, public health experts and scientists to trace the path of the 1918-19 pandemic. An eerily familiar story of loss, resilience and discovery in a world turned upside down.