The article examines the use of state secrecy in court litigation concerning alleged gross human rights violations committed in the struggle against terrorism, focusing specifically on cases of extraordinary rendition and comparing the performance of courts in the United States, in Italy and the European Court of Human Rights (ECtHR). The article explains that national courts have validated the assertion by national governments of the state secret privilege in litigation involving cases of extraordinary rendition, ensuring de facto immunity to individuals involved in gross human rights abuses. On the contrary, it underlines that the ECtHR has pierced the veil covering these deep secrets', undertaking a strict scrutiny of acts of extraordinary rendition to torture committed by governments in the name of national security. As the article argues, the success of the ECtHR can be explained by a number of reasons, including distance, time and institutional design. In conclusion, the case law of the ECtHR on secrecy and national security confirms the continuing importance of supranational courts as instruments of external oversight on the human rights practice of European states.