Today we are on the trail of a 10-year old skeleton in Poland's cupboard, potentially involving the country in a dark chapter in the history of the CIA.
Last month, a new report from the Open Society Justice Initiative shed glaring light on the CIA's so-called "rendition" programme - that is, flying suspected terrorist prisoners to secret sites outside the US and subjecting them to what the Americans called "enhanced interrogation techniques", something the report itself calls torture. It has been alleged that one of the secret jails was located in Poland.
Two men named as victims have now filed cases with the European Court of Human Rights, and although an official investigation is underway, it has made little progress. France 24's Gulliver Cragg reports from the alleged site of the prison.