X12 Skarda's Mirror
An interesting and atypical adventure in its writing style. For one the module contains insightful "When things go Wrong" sections and DM guidance for sticking close enough to the rails for the story and fun's sake. Lots of DM hints about how to handle PCs' choices. Overall the story is fine too - a traditional hook, a mystery, some twists. There's a tower, a surprise pocket-dimension context, and a dungeon.
It's mirror of life trapping, isn't it?
Well, yes and no. People go in, and they don't come out. Nor can you talk with anyone inside. Somehow, that's not quite the way you remember those mirrors work.
This Skarda fellow showed up a few years ago with a band of raiders, and no one in the land has been safe since then. Whole villages have disappeared into this Skarda's mirror. Your band is approached by relatives of one of the victims?and adventurer like yourselves.
You have to get into that mirror of whatever-it-is, find this man, and get him out in one piece. The reward is more that adequate. Only problem is, no one out here can tell you what to expect once you get in? or even how to get there.
TSR 9188