How could Nazi killers shoot Jewish women and children at close range? Whydid Japanese soldiers rape and murder on such a horrendous scale? How wasit possible to endure the torment of a Nazi death camp? Award-winningdocumentary maker and historian Laurence Rees has spent nearly 20 yearswrestling with these questions in the course of filming hundreds ofinterviews with people tested to the extreme during World War II. He hascome face-to-face with rapists, mass murderers, even cannibals, but he hasalso met courageous individuals who are an inspiration to us all. In "TheirDarkest Hour", he presents 35 of his most electrifying encounters.