In 1944 a groundbreaking operation repaired the congenital heart defect known as blue baby syndrome.
The operation's success brought the surgeon Alfred Blalock international fame and paved the way for open-heart surgery.
But the technique had been painstakingly developed by Vivien Thomas, Blalock's African American lab assistant, who stood behind Blalock in the operating room to give him step-by-step instructions.
The stories of this medical and social breakthrough and the lives of Thomas, Blalock, and their colleague Dr.
Helen Taussig are intertwined in this compelling nonfiction narrative.