PEOPLE MAGAZINE INVESTIGATES delves into the 1977 brutal assault and murder of three Oklahoma Girl Scouts away at summer camp: Lori Lee Farmer, Doris Denise Milner and Michele Heather Guse. The case dominated national headlines for more than a year as law enforcement scrambled to find answers. PEOPLE's reporting team takes viewers through the twists and turns of this case, from how local authorities zeroed in on a suspect (a prison escapee with a dangerous past), the all encompassing manhunt to track him down and the subsequent trial that led to heartbreak for the victims' families and many unanswered questions. Featuring an exclusive emotional, new interview with Lori Lee Farmer's parents and siblings, as well as testimony from jurors on the trial and experts close to the case.