This work investigates the complex, lifelong partnership between Helen Keller and her teacher, Anne Sullivan Macy, to determine how their symbiotic relationship shaped their individual identities and public legacies. Joseph P. Lash, a Pulitzer Prize-winning biographer, utilizes extensive archival materials and personal correspondence to reconstruct the private lives of these two figures. He examines the psychological and social dynamics that sustained their connection from Sullivan's impoverished childhood in an almshouse to the height of their international influence. The narrative framework provides a chronological analysis of their mutual dependence and the challenges they navigated within the public eye.

Historians and critics frequently cite this work as a definitive and meticulously researched account of the relationship between Keller and Sullivan. Readers often note the depth of the archival research, which provides a nuanced view of the personal struggles behind their public personas.