Lucky Starr and the Big Sun of Mercury is the fourth novel in the Lucky Starr series written by the legendary Isaac Asimov, author of I, Robot, Foundation, and the Galactic Empire series. The Lucky Starr series was originally published under the pseudonym Paul French.

"Ghosts!" cried the engineer wildly, flinging his arms about. "I've seen them, but will anyone believe me?"

Bigman said, "Ghosts! Are you nuts?"

At once Mindes screamed, "You don't believe me either. But I'll prove it."

With a harsh screech of laughter, he drew his blaster, and with frenzied speed, before Bigman could move to stop him, he aimed it at Lucky at pointblank range and squeezed the trigger ...

Can Bigman save Lucky, before it's too late?