His very obsession by Lupin hampers him.

It cramps his mind and hinders its working," said M.Formery.
He resumed his meditative pacing, stopped again, and said: "But considering everything, especially the absence of any traces of violence, combined with her entire disappearance, I have come to another conclusion.

Victoire is the key to the mystery.

She is the accomplice.

She never slept in her bed.