Are you still in the first act, on the first maze level? There is a room there with a statue that triggers the appearance of 4 skeletons when clicked, though the act 1 doll is a reward for helping the imps on the previous level.
If that is where you are, you need to head south, west and south, then east through a large room filled with traps, then through another section of corridors with a room in (roughly) the middle, containing a portal you need to go through to proceed. After a brief detour, you will end up in a place with two portals, one (in the south) to return to the first maze level, and another (north) to continue to the second, smaller maze level.