The world’s crops have been destroyed by a mysterious virus, and the end of mankind draws near. However, the Grey aliens from Xi Boötes, the constellation of the farmer, have coincidentally come to the rescue. The Greys have promised to take everyone to a better world, one with fertile land, clean oceans, living space, and without war and want. But it could be a perilous journey, for in the universe humans do not sit atop the food chain.

Commander Scott McNabb and the crew of the science vessel, Hermes, are three years into a five-year-long survey of the asteroid belt when they discover a derelict spaceship in orbit around a binary asteroid. The ship contains an experimental quantum device, lost while en route to a research colony on Europa.

Grad student Danae Panya's dream assignment has been approved. She'll study Triplet, the strange planetary system scarred by nuclear war and connected through portals. The most experienced Courier of Triplet, Ravagin, will lead her to its hidden worlds—Threshold, Shamsheer, and Karyx—and introduce her to their secrets, including their advanced technology, their dark magic, and the captivating demon culture of the innermost planet.

Rejected scientist Alexander Hawke is down to his last chance. Brilliant but sheltered, every banker in New York has refused to finance his ideas. Enter the Russian—charming, dangerous, and offering an Antarctic expedition that promises answers to all of his questions. Now, Alexander stands at the edge of a bottomless chasm. With a helpful shove from his foreign benefactor, he plunges into adventure. Landing in darkness, Alexander finds a portal to destiny—weirder than New York, colder than Russia, and filled with the ruins of an empire that once spanned the galaxy.

Fueled by a powerful curiosity - and by a need to see, feel, and hear, firsthand and close-up - Michael Crichton's journeys have carried him into worlds diverse and compelling - swimming with mud sharks in Tahiti, tracking wild animals through the jungle of Rwanda. This is a record of those travels - an exhilarating quest across the familiar and exotic frontiers of the outer world, a determined odyssey into the unfathomable, spiritual depths of the inner world.