I wish the instructions explained what the "Hostile Action Actor" field meant. From experimentation, it seems to mean "this person is either the assassin or the victim, figure out which yourself", but since this isn't explained anywhere you can get sucked into a separate mystery.
Some of the visitors are listed as being from the "Shadow Fighter IC-002", but the relevant comm has it listed as "Shadow Figher IC-002", making it unsearchable.