Monkswell Manor guest Christopher Wren has just confessed part of his
Giles: What is all this? Mollie, you must be crazy. Perfectly prepared to shut yourself up in the kitchen with a homicidal maniac.
Mollie: All right then, I’m crazy! Why not? Perhaps it’s fun to be crazy!
Christie, Agatha. The Mousetrap. Samuel French, 1982, pp71-73.