Based on the content, it seems that you are referring to a play or a story that involves a police inspector interrupting an upper-class English family dinner. Here's a revised version of the sentence:
"A famous stage play set in 1912 features an upper-class English family dinner, which is interrupted by a police inspector who brings news that a girl known to everyone present has died in suspicious circumstances. It seems that any or all of them could have had a hand in her death."
In this revised version, I've added more context and clarity to the sentence. The original text was already quite detailed, but here's how I would revise it for better readability:
"Based on a well-known stage play from the year 1912, an upper-class English family dinner takes place, only to be interrupted by a police inspector who delivers shocking news: a girl known to everyone present has died in suspicious circumstances. It becomes clear that any or all members of the family could have been involved in her death. Who exactly is this mysterious inspector? And what do they want of them?"
This revision maintains the essence of the original while adding clarity and detail.