None
19 of 20 found this to have none
Mild
12 of 20 found this mild
Guests are killed, but not a single one-except the final one shows the death explicitly.
Seventh: A man dies a mysterious death from the sea (take note this is revealed after the eighth death).
None
15 of 17 found this to have none
The word "devil", as in "what the devil", presumably used in place of "what the hell", which would not have been allowed by censors of the time.
Mild
14 of 17 found this mild
Occasional and casual smoking and drinking. The butler at one point drinks a little too much. "Nikki" is completely drunk when he sings the song at the piano.
Mild
9 of 16 found this mild
The setting is full of subtle duplicity and darkness.