The power of prophecy is given to few. Wise are they who guard this gift well, for those who thirst after such knowledge are not always men of principle. Bastion of destiny, the Tower of the Heavens stands silhouetted against the star-studded night sky. From within his darkened observatory, perched like an eyrie on the highest turret, a figure in white charts the course of a shooting-star as it disappears behind the snow-capped peaks of the Tegefed mountains. The old man smiles grimly to himself; the event foretold has come to pass! Power, glory, riches - it takes years to acquire them. The uncanny accuracy of their predictions has brought all these and more to the sages of the Tower of the Heavens. But what is hard to win is often easier to lose, and the future of the tower now hangs in the balance. For it is written that the day of reckoning draws nearer when a star falls...
One of the better modules from the AD&D era, it features an unusual plot hook and a variety of enemy types in several small encounter areas. This module doesn't resort to any of the ridiculous "special invulnerable magic" mechanisms, has realistic reward potentials, and at least on the surface doesn't seem completely over the top in being deadly. The party will have to think their way through a few encounters but all in all, I found "When a Star Falls" to be a strong product for its time.