The events bookending this movie are true, but the actual story is pure speculation...thus leaving the door wide open for the storytelling.
Communist Catholics are an oddity...the contradictions in that appellation alone are manifest. So what we have here is told somewhat in the manner of a Passion Play, cross-pollinated with a critique vs. defense of the Marx-Hegel "Holy Family"...the argument centers on the captive's immediate concern about execution, whereas the captors insist on demonstrating they are merciless.
The problem is, all of this seems to be going on as if there's no outside world of concern...oh, we get leakage in from TV and newspapers, but no sense that Rome is under lockdown. This ends up totally alienated from the central symbolism (Mora's body having been found precisely halfway between the respective Christian Democrats' and Italian Communist Party's headquarters). We're locked behind the writing (the stacks of books, and simultaneously, Chiara within the library), then left for dead with no spatial, political or symbolic context.
That said, there is some cleverness in the limitation placed on Chiara, who is the only one who can tell the story outside the apartment, but has a proximity barrier from the writer at the cubicle door and peephole. Upon reaching perigee, she is reduced to defiant tears. Note also how she dreams in Soviet-era propaganda films!
