At two in the morning the boiler knocks like somebody at the door and you go up the corridor with a lamp.

Mione is already there in a coat over a dressing gown, measuring the wall with a tape.

MioneI am not snooping. I am measuring. There is a floor between the third landing and the roof that is not on the plan.

She shows you the 1604 survey. A school undercroft, drawn once, listed nowhere since.

MioneIf I can list a room nobody has listed, I can pass this building. If I cannot, the fourteenth is the last day.