B3: Palace of the Silver Princess is an adventure module for the Dungeons & Dragons Basic Set, but works fine with modern retroclones like Basic Fantasy RPG.
This is the re-written version, with Jean Wells' name on it but much revised by Tom Moldvay. In future episodes we'll look at the original release by Jean, and do a comparison.
The plot of Palace of the Silver Princess revolves around a country frozen in time by a strange red light. The only seemingly unaffected location and the apparent source of the glow is the royal palace. The adventurers must restore the flow of time and save the country.