Fifty years in the future, scientists race against time to mend a black hole in the Earth's core before it destroys the entire planet within two years

From one of the most critically acclaimed and well-loved authors of contemporary science fiction, a highly imaginative and exciting story as only David Brin can write . . . “High spirits and inventiveness . . . Dennis's adventures, which can only be called rollicking, are legion.”—Isaac Asimov's Science Fiction MagazinePhysicist Dennis Nuel was the first human to probe the strange realms called anomaly worlds—alternate universes where the laws of science were unpredictably changed. But the world Dennis discovered seemed almost like our own—with one perplexing difference. To his astonishment, he was hailed as a wizard and found himself fighting beside a beautiful woman with strange powers against a mysterious warlord as he struggled to solve the riddle of this baffling world.“A delightful, often very witty story, with the underlying thoughtfulness we expect from David Brin.”—Poul Anderson

"We never expected that inventing Star-Drive would lead to this! We were first! Humans invented star drive, bringing light and movement to the galaxy, forging a grand alliance with all races. (Well, most of them.) It seemed the galaxy was ours to lead and to share! Till we met demmies. Oh, they're not so bad. They mean well. Impulsive and exasperating, sure. Often brilliant, cheeky, moronic, volatile, always astonishing... did I mention exasperating? And lucky. Gradually, it dawned on humanity- Hey, that's what we wanted to be! In ancient sci-fi dreams, we pictured ourselves as the impulsive-lucky ones, not wise-patient elders. Only now... ... they reverently call Earthlings "the Ancient Ones." And demmies are having all the fun! Dr. Alvin Montessori is Human Advisor aboard the mostly demmie-crewed star cruiser Clever Gamble, orbiting Oxytocin 41, where something weird is going on. It starts when the crew unreels a humongous hose down to the surface... ... and their first contact team discovers a whole lot of 'something weird.'"--