From publisher blurb:
Welcome to the fourth adventure in the ZEITGEIST adventure path!
This is the D&D 4th Edition version of this adventure.
The famous Avery Coast Railroad thunders along its week-long journey through the grandest cities of civilization. Among its roster of international passengers travel stowaways and scoundrels, slavers and spies - and one shadowy figure, bearing an invention that will illuminate the world and cast it into darkness.
Riding undercover, agents from Risur have one week until this invention falls into the hands of a sinister conspiracy. Before then, they must suss out who they can trust, and who's out to stop them. But on a train full of liars, will they be able to solve the mystery in time?
A fantasy adventure for motivated heroes of levels 8-9.