Old Fezziwig
Thanks for the sour persimmons, cousin.
Carrach: You noodle around the southern end of the corridor [Track feat, Survival check, roll of 13 on d20, +5 skill ranks, +1 Wis, +2 synergy with Search, total 21, success]. The tracks of the creatures lead south and then split, one pair coming from the west, seemingly through a gear-shaped doorway (roughly fifty feet south of the party's location at the start of combat). The other pair continues to head south for another ten feet before the tracks disappear. The hall continues on for another twenty feet before ending in a wall, with a door to the east and another to the west.