This has too much follow-the cop I think. Neapolitan claims day 2, Doctor on neapolitan night 2 while the neapolitan investigates night 2, then night three the jailkeeper jails the neapolitan, then the doctor protects the neapolitan again night 4.
It's not backbreakingly powerful but it's not as much fun to work out the details of strategies like that as it is to play setups without any such interactions.
"Let us say that you are right and there are two worlds. How much, then, is this 'other world' worth to you? What do you have there that you do not have here? Money? Power? Something worth causing the prince so much pain for?'"
"Well, I..."
"What? Nothing? You would make the prince suffer over... nothing?"