Netflix’s upcoming docuseries Wormwood mixes fiction and nonfiction to investigate a thicket of decades-long conspiracy theories around the CIA — and how one family may have paid the price for the agency’s secrets. But to Errol Morris, its Oscar-winning director, Wormwood‘s key mystery is fairly simple. “It’s a room,” he tells PEOPLE of the six-part series, exclusively previewed above. “When you boil it all down, there’s a room in this hotel on Seventh Avenue in New York overlooking the old Penn Station. Just after Thanksgiving 1953, Frank Olson, an Army scientist, goes out a window 13 floors onto the pavement below. What happened in that room? What in God’s name happened in that room?” “All of Wormwood is an attempt to reconstruct that, to reconstruct the mystery of that black box, the four walls of that room and what transpired,” Morris continues. “Was Frank Olson committing suicide, was this an accident or was it something else?” Olson’s name — and the disputed details of his death — will be familiar to longtime followers of CIA controversy: He first made national news in the ’70s, when a government report on the intelligence agency’s activities confirmed it had secretly dosed him with the drug LSD nine days before he died. That revelation touched off his family’s quest for answers, which has dominated the life of Olson’s son Eric. In 2012 the Olsons said they would sue the CIA, alleging their father was murdered because of what he knew about the agency and his death was covered up. (The CIA reportedly declined to comment at that time and PEOPLE could not immediately reach agency representatives for comment on Wormwood.) Morris, the director of The Thin Blue Line, The Fog of War and other documentaries, says he found the controversy “unbelievably interesting” and an important reflection of America’s behavior toward its own citizens. • Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter. Originally interested in working on a project about MK-Ultra, a mid-century CIA program incorporating a variety of behavioral experiments (among