This documentary explores the shocking true story of Joanne Dennehy, the most dangerous woman in a British prison. In 2013, Dennehy went on a 14-day killing spree, murdering three men and attempting to kill two others. Using exclusive police evidence, this film delves into the mind of a serial killer, examining Dennehy's background and motivations to uncover what drove her to commit such heinous crimes. With insights from those who knew her best, this documentary provides a chilling look into the making of a serial killer.

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Some movies that have similar genres and were produced around the same time as Joanne Dennehy: Serial Killer include On Putin's Blacklist, Homme Less, Iris, Salam Neighbor, David Foster: Off the Record, Three Identical Strangers.