The Devil Box
"The Devil Box" is a D&D adventure suitable for four 2nd-level PCs, although it can be modified for parties of 1st or 4th-5th levels as noted int the "Scaling the Adventure" sidebar. Characters completing the adventure are likely to advance to 3rd level. Much of the action takes place in a small town during a festival; this town can easily be dropped into an existing campaign. Since "The Devil Box" expects the PCs to deal with kobolds as temporary allies, it throws in some ethical dilemmas for good-aligned characters. Paladins and good-aligned clerics my have difficulties with such an alliance, but kobolds are definitely the lesser of the two evils involved in this adventure. If the party spurns the assistance of potential kobold allies, you may wish to modify the adventure to make it a bit easier on the player characters, as encounters have been written with the assumption that the heroes have a little help.
Uploader's note: A hilariously creepy adventure involving a circus (freakshow), with in style illustrations! (Grid maps included, but not separate maps.)