On February 28, 1986, Swedish Prime Minister Olof Palme is shot dead on the streets of Stockholm. The future author of the Millennium Trilogy, Stieg Larsson, who at the time was an illustrator for the anti-fascist newspaper Expo, begins intensive research into the assassination, which remains unsolved to this day. He continues his investigations for years, until his early death in 2004. It is not until 2014 that journalist and documentary filmmaker Jan Stocklassa comes across Larsson's personal archive. He gains access to the estate and discovers in twenty cardboard boxes Larsson's private investigations into the murder of Olof Palme. In his book, Stocklassa recounts the previously unknown research of the bestselling author as a fascinating true crime story.