Ethiopia, 1954. Twin boys conjoined at the head survive a surgical separation and a gruesome C-section delivery. Their mother, Sister Mary Joseph Praise, does not. The Carmelite nun, a native of India, dies in the same place where she worked as a nurse - the operating room of a small hospital in Addis Ababa. The facility is dubbed Missing Hospital, and it is staffed by some remarkable people.

Thomas Stone is a British general surgeon. The only thing that he loves more than medicine is Sister Praise. When she dies during childbirth, he has a meltdown - abruptly fleeing the hospital and leaving Africa. Although Thomas Stone is the father of the twins, he blames the babies for the nun's death. Decades later, he is working at a prestigious medical center in Boston where he specializes in hepatic surgery and research on liver transplantation. The twins are raised by two physicians at Missing Hospital - Dr. Ghosh and Dr. Hemlatha (Hema) - who get married. Hema is an obstetrician-gynecologist. Ghosh is an internist who becomes the hospital's surgeon by necessity after Thomas Stone departs.

The fate of the twin boys, Marion Stone and Shiva Stone, is sculpted by their experiences at Missing Hospital and the growing pains of Ethiopia. The African nation is full of possibilities and mayhem. Both boys are highly intelligent and unusually bonded. Shiva is eccentric and empathic. Although he never attends medical school, Ghosh and Hema train him. Shiva becomes a world authority on treating vaginal fistulas. Marion narrates the story. He is repeatedly hurt by love. The girl of his dreams, Genet, opts to have her first sexual encounter with Shiva. Genet plays a role in hijacking an airplane and rebels against the Ethiopian government. Although innocent, Marion comes under suspicion because of her actions. He escapes the country for his own safety.

Like his father, Marion lands in America. He completes his residency training as a trauma surgeon in New York. He locates his biological father but reconciliation is difficult for both men. Genet has also come to America. She shows up at Marion's apartment, and they have sexual intercourse. Genet exposes him to tuberculosis and Hepatitis B. Marion delevelops liver failure due to hepatitis. He is going to die. Shiva and Hema travel to New York to be with Marion. Shiva proposes an experimental treatment for his brother - a living donor liver transplantation. After all, there is no better organ donor than an identical twin. Thomas Stone performs the operation along with one of Marion's coleagues. The surgery is successful. Then Shiva has bleeding in his brain and dies. Marion returns to Ethiopia and Missing Hospital. Half a century removed from his birth, Marion is back at home and still conected to his twin brother. The lobe of liver donated by Shiva is functioning perfectly.