A gripping biography of the infamous Nazi doctor, from a former Justice Department official tasked with uncovering his fate.

Perhaps the most notorious war criminal of all time, Josef Mengele was the embodiment of bloodless efficiency and passionate devotion to a grotesque worldview. Aided by the role he has assumed in works of popular culture, Mengele has come to symbolize the Holocaust itself as well as the failure of justice that allowed countless Nazi murderers and their accomplices to escape justice. Whether as the demonic doctor who directed mass killings or the elusive fugitive who escaped capture, Mengele has loomed so large that even with conclusive proof, many refused to believe that he had died.

As chief of investigative research at the Justice Department's Office of Special Investigations in the 1980s, David G. Marwell worked on the Mengele case, interviewing his victims, visiting the scenes of his crimes, and ultimately holding his...