The charter is four hundred and twenty-two years old and Mione has read it twice, which is twice more than the governors who signed it.

Clause nine is one sentence: on the shortest night the School shall keep one light in the Ninth Chamber, and the keeper shall not sleep.

MioneThere is no Ninth Chamber. It is not on the plan. This is a room that has been required and never built.

She says it out loud in an empty library, and something in the east wing settles into place like a bolt going home.