The controversial 1991 War Crimes Act gave new powers to courts to try non-British citizens resident in the UK for war crimes committed during WWII. But in spite of the extensive investigative and legal work that followed, and the expense of some 11 million, it led to just one conviction: that in 1999 of Anthony (Andrzej) Sawoniuk. Drawing on previously unavailable archival documents, transcripts of interviews with suspects, and disclosures...