Ravenloft - Castle Ravenloft #1
At Caesius's prompting, even as the Paladin stands guard, crossbow at the ready, Zertin ponders his options for the mystical kindling of illumination, while Violet chooses a more mundane method, igniting her oil lantern that she might better see what faces her within the Northern tower on whose threshold she perches ...
Within the one hundred foot high tower, revealed by the carefully hooded light, the young woman casts her eyes over the inner workings of the mechanisms that raise and lower both the drawbridge and a portcullis (or at least half of such machinery, for she deduces the Southern tower might contain much the same).
There are no windows or other openings in the tower, just a solid-looking wooden door at the base, tightly shut, which would allow access to the tower from the inner courtyard of the castle.
Sadly, Caesius has already given up his rope to join to that of Zertin to provide an anchor for Violet.