The One Who Knows
Space archeologist determines why an entire alien race disappeared.
An archeolgist on an alien planet discovers why the inhabitants disappeared.
A young cat-like archeologist discovers why an alien race abandoned their planet hundreds of years earlier. A boy of that race, able to see the future, warns of a planet-killer approaching and helps find a way to send his race off-planet. Unfortunately, he must stay behind and composes a letter to the archeologist thanking her for telling the tale of his people.