This early Bergman film is watchable, creative and impressionistic in its visuals and, it must be admitted, pretty bleak. It also, in many ways, looks like the slightly immature anguish of a young artist rather than the far deeper and more subtle essays on existence which Bergman produced later in his career.
The premise of the film is boldly (and baldly) stated - a young film director is given the suggestion for a new film - is life hell? He turns the idea down but events for two couples explore this idea, including, crucially, the sufferings of a prostitute. Bergman posed the following questions as an introduction to the film: "What is her guilt that she has to live this nauseating life? Is earth Hell? And is there in that case also a God, and where is He, and where are the dead? I wanted to make a film about this, and I wanted to make other people just as agitated and inquiring about it as I am."
There are several experiments with film form here - credits are read in voice over, there is a film within a film and a dream sequence, and it is on the whole a good watch - but the material is raw, and somehow a little adolescent. Within a couple of years though, masterpieces like 'Summer Interlude' would start to appear. By comparison, 'Prison' looks like some sketches before the main events.
Recommended for Bergman completists and anyone looking for slightly forgotten European / art cinema. As always, the Tartan DVD release provides an excellent print and a handful of small extras - a 4 page booklet, film notes and trailers for other Bergman films.