Reissued after seventy-five years out of print-and in hardcover for the first time in a generation-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 Foundation, the Galactic Empire series, and I, Robot. The Lucky Starr series was originally published under the pseudonym Paul French.

"Ghosts!" cried the engineer wildly, flinging his arms about. "There's a white ghost and a red ghost. You've seen those. But there are two-legged ghosts too. I've seen them, but will anyone believe me?" He was almost incoherent. "I tell you-I tell you-"

Bigman said, "Ghosts! Are you nuts?"

At once Mindes screamed, "You don't believe me either. But I'll prove it. I'll blast the ghost. I'll blast the fools who won't believe me. I'll blast everyone. Everyone!"

With a harsh screech of laughter he had drawn his blaster, and with frenzied speed, before Bigman could move to stop him, he had aimed it at Lucky at pointblank range and squeezed its trigger. Its invisible field of disruption lashed out-

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