In one of President Barack Obama first acts in the White House, he ordered the closure of the CIA’s so-called “black-site” prisons, where terror suspects had been held and, sometimes, tortured. The CIA says it is “out of the detention business,” as John Brennan, Obama’s pick to head the agency, recently put it.

But the CIA’s prisons left some unfinished business. In 2009, ProPublica’s Dafna Linzerlisted more than thirty people who had been held in CIA prisons and were still missing.

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Some of those prisoners have since resurfaced, but at least twenty are still unaccounted for.