From the introduction:
The [player characters] discover the entry portal to the Anvil of Time, an ancient complex where time travel devices were once built millennia ago. The exit portal, however, is not properly powered. The [player characters] will need to use the central device of the complex and travel through three different time periods of the past in order to realign the stones powering the device and escape the ancient complex.
User summary:
For four 5th level characters. Two manuscript copies of the scenario are available for public reading at Tracy and Laura Hickman manuscripts for Anvil of Time role-playing game; MSS 8180; Tracy and Laura Hickman papers; L. Tom Perry Special Collections; Literary Manuscripts; 1130 Harold B. Lee Library; Brigham Young University; Provo, Utah 84602. Note the printed text of the two copies is the same, but the handwritten annotations vary significantly.