In That Time tells the story of the American experience in Vietnam through the life of Michael O'Donnell, a promising young poet who became a soldier and helicopter pilot in Vietnam. O'Donnell wrote with great sensitivity and poetic force about his world and especially the war that was slowly engulfing him and his most well-known poem is still frequently cited and reproduced. Nominated for the Congressional Medal of Honour, O'Donnell never fired a shot in Vietnam. During an ill-fated attempt to rescue fellow soldiers, O'Donnell's helicopter was shot down in the jungles of Cambodia where he and his crew remained missing for almost 30 years.

In telling O'Donnell's story, In That Time also tells the stories of those around him, both famous and ordinary, who helped to shape the events of the time and who were themselves shaped by them. The book is both a powerful personal story and a compelling, universal one about how America lost its way in the 1960s.