Answer:
Zaroff acts nice to Ransford at first, which makes it seem like he's a good guy even though there is a bit of an ominous feeling of the place. Then it turns out the bad feeling is correct and Zaroff is the bad guy.
Explanation:
I don't have the book on me right now, so I can't cite directly. But He acts welcoming and all "hey let's hunt and smoke together", but then he's like "I wanna hunt you till you're dead!!"
