In "The Dagger with Wings" by G. K. Chesterton, Dr. Boyne was talking to Father Brown after the priest said he suspected the murderer was Impersonating the murdered man.
Boyne said: "There is something very queer and close to the nerves, I think, about notions affecting identity. I don’t know whether it would be more weird to get a guess like that swiftly or slowly. I wonder when you suspected and when you were sure."
What's meant here by close to the nerves? Does it mean causing tension?