As Michelle's loved ones cope with her sudden death, her work to unmask the Golden State Killer lives on. After inheriting Michelle's 37 boxes of case files, Paul Haynes and Billy Jensen work alongside Patton Oswalt, to finish her book.

This featured series is a gripping examination of the unsolved crimes of the Golden State Killer who terrorized California in the 1970's and 1980's. Sensitively handled at all turns, I’ll Be Gone in the Dark is different from your standard true crime series. Highly emotional in both a restorative cathartic, but also a genuinely upsetting way.
In the first episode, the writer Michelle McNamara finds a new obsession in the 'East Area Rapist', who terrorized California in the 1970s and '80s, responsible for 50 home-invasion rapes and 12 murders.

In 1979, law enforcement is thrilled when the East Area Rapist attacks abruptly stop in Northern California. But in reality, the East Area Rapist had only moved 400 miles south, to commit a number of gruesome murders in the Santa Barbara area, where he would become known as the Original Night Stalker. Michelle McNamara ultimately came up with the name 'Golden State Killer' cause he terrorized up and down the state.
Michelle starts to write a true crime book that would transcend the genre because the way she humanized all of the victims.

Michelle McNamara reflects on the 1984 murder of her childhood neighbour Kathy Lombardo, which she credits with planting the seed for her lifelong fascination with unsolved crimes. Michelle really wanted this child and wished to get her murderer caught. The story of the victims has to be told.

Michelle McNamara and her editors agree to push her book deadline after being granted access to the Orange County Sheriff's Department's East Area Rapist / Original Night Stalker room. After everybody realized the killer moved south, that story exploded. The hope was that by having greater public attention, the right person gave the right tip.

After four decades of searching for him, they got a one hundred percent match to the Golden State Killer's DNA. As 72-year-old former police officer Joe DeAngelo's arrest unfolds in real time, chilling facts materialize that illuminate Michelle McNamara's prescience in her book's epilogue.