Reptile shines the dim light of the hooded lantern up the ladder to illuminate the trapdoor so that he and Myrtha can see. There is no lock on this side, and the hinges are above. They have a pretty fair idea that it leads up to one of the back rooms of the Inn on the ground floor.
Theran, meanwhile, has glanced at these things with his darkvision. His attention is drawn to what they haven't seen yet: a sturdy oak door in the southern wall, that has been barred on this side. Like the bar on the Wine Cellar Door, the bar for this door is held in place by metal brackets on the door and the wall on either side.
Rolls
Mysterious roll 2 - (1d20+2)
(9) + 2 = 11