7, how does Wimsey (as well as the other characters) reveal the “double nature” of human being

[Jen]

7. Consider as you read the novel, how does Wimsey (as well as the other characters) reveal the “double nature” of human beings?

[[deleted user]]

Wimsey wanted to solve the mystery and then wished there had been no mystery to start with.

[Pip]

The obvious double nature exponent is Jeff Deacon, who took on another man's identity, and, indeed, a third persona. I am not sure what the question refers to in regards to Wimsey. Perhaps another reader will be able to enlighten me.