I love how fully Gideon the Ninth commits to the country house murder mystery vibe.
Not only has everyone been called to an ostentatious and decrepit pile by a mysterious benefactor, but you have a great range of murder mystery stereotypes:
- Military officers who think the whole murder thing could be resolved with just a bit more discipline
- Gorgeous socialite sisters with a dark secret
- Eccentric gentlewoman scholar and her young wards
- Professor curiously close to his manservant
- Tragic convalescent
- Useless clergyman
- Socially awkward orphans
Not to mention the staff of the house who do not seem to be entirely honest about its past.