This is probably the best documentary you will find on the Starkweather killings. Starkweather comes across, rightfully, as a unhinged evil monster yet, somehow, and we will never know why, acted out all this horror in some form of love bond with Fugate. And that is what has spawned so many movies, mostly bad, based on the duo.
The filmmakers have a ax to grind though. They want us to believe in Fugate's total innocence. They defeat this purpose in numerous ways. The film clips and pictures of Fugate during the time of her surrender and Starkweather's capture show a young girl with nothing but a cold, emotionless, blank face. There is zero indication that any of the absolute horrors had any effect on her in any way. In fact, she is wearing the expensive coat of the wealthy Lincoln wife that was brutally slain and bragging about how nice it is.
Fugate changes her personality the longer she is behind bars and the brutal realization that she may be there for life sinks in. The authorities saw this at the time.
The documentary does allow for some comments from non-believers in her innocence who feel she was in her element the whole time only giving up "when the jig was up" and that no one but Starkweather and Fugate really know what happened because they left no witnesses. A fair point.
Ultimately, the authorities in Nebraska in 2020 had the final word when they denied her pardon.