Tosha says: "I would advise you, meanwhile, against trying to enter any part of my office other than the receiving room. Please warn Mr Finch-Fletchley in particular that when I am away from the castle for longer than thirty-six hours, the wards all reset themselves, and all access is revoked, until I am able to disarm them; he will be very badly injured"

Was the Book in the receiving room? We can at least make an attempt on that.

Also. He says nothing about his personal rooms. I have an idea or two there, but I think it can wait.