From 1932 to 1945, in a headlong quest to develop germ warfare capability for the military of Imperial Japan, hundreds of Japanese doctors, nurses and research scientists willingly participated in what was referred to at the time as 'the secret of secrets' - horrifying experiments conducted on live human beings, in this case innocent Chinese men, women, and children. This was the work of an elite group known as Unit 731, led by Japan's answer to Joseph Mengele, Dr Shiro Ishii.

Under their initiative, thousands of individuals were held captive and infected with virulent strains of...