Guardroom of the castle(d, n and e)

You stand in a spartan guard room. This seems to be the headquarters of the on-duty sergeant of the guard force for the castle. A simple desk sits against one wall, and a weapon rack lines another. A chair sits in front of the desk, unoccupied. A large slate board covers most of the wall above the desk.
The north door is open.
The east door is open.
The only obvious exits are down, north and east.
A sergeant of the guard
A desk (closed)