[Daniel] Jones, a counter-terrorism staffer, had become the chief investigator for the Senate intelligence committee, the CIA's congressional overseer, on its biggest inquiry. For five years, he had been methodically sifting through internal CIA accounts of its infamous torture program. Having read millions of internal emails, cables and accounts of agency torture, Jones had come to believe everything the CIA had told Congress, the Bush and Obama White Houses and the public was a lie. Inside the small room in Virginia the CIA had set up for the Senate investigators, Jones ... slipped crucial printed-out passages of what he called the Panetta Review into [his] bag and secured its lock. Sometime after 1am, Jones walked out, carrying his bag as he always did. The Panetta Review saga would spur a furious CIA to take an extraordinary step: it would spy on its own legislative overseers - especially Jones. The episode would spill out publicly the following March, when top committee Democrat Dianne Feinstein ... accused the CIA on the Senate floor of triggering what she called a constitutional crisis. Both sides requested the justice department pursue a criminal investigation on the other. The bitterness would nearly overshadow a landmark report, a fraction of which was released to the public in December 2014, that documented in chilling detail the depravations CIA inflicted on terrorism suspects after 9/11. The CIA has gone beyond successfully suppressing the report. The agency's inspector general ... destroyed its copy - allegedly an accident.