WHEN NANCY GOES STARGAZING, SHE CATCHES A COMET OF AN ADVENTURE BY THE TAIL! Nancy and George are thrilled when Bob "Dr. Stars" Steller, a cool astronomer with a popular radio program, comes to River Heights for the Perseid meteor shower. Bess goes into orbit when she learns that a Hollywood heartthrob and his girlfriend are also in town secretly. But when Nancy finds Steller's van deserted and runs into a hostile rival of the astronomer, she senses a dangerous black hole in the event. Then Dr. Steller finally appears -- or is he an optical illusion? As Nancy uncovers more evidence, her suspicions lead her into a sinister scheme moving faster than the speed of light!