Based on a stage play 'Jump To Cow Heaven', this story of Frank Mitchell aka The Mad Axeman doesn't need to be opened out because of the events (guessed at) that really happened. But at the same time, this does feel like a filmed 'play'. Don't be put off, as the central three performers are excellent and the film has been nicely shot, including sequences on a dark and grey Dartmoor (wild ponies included). In 1966, the Kray Twins sprung Frank Mitchell from Dartmoor Prison and holed him up in a London flat with a minder and a blonde to keep him quiet. With challening mental problems, the dynamic for an interesting showdown is well-established. The Kray Twins fail to show up and their motivations are sketchy as to why they bailed him out in the first place. Read up on the real events, but officially Mitchell is still at large to this day. Spooky.
Recommended if you like performance led pieces. The Krays: Dead Man Walking (produced by Jonathan Sothcott) covered the same news story but their film was very bad by comparison.