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* Longlisted for the 2019 Wilbur Smith Prize for best published novel. *A new ice age... and a shocking discovery... will change humanity forever.In the near future, an ice age pushes the human race to the edge of extinction.Scientists search for the cause--and any hope of stopping the Long Winter. They send probes into the solar system to take readings. Near Mars, one of the probes makes a shocking discovery: a mysterious object, drifting toward the Sun. Is it the cause of the Long Winter? Or could it be our only hope of survival?With time running out, NASA launches a mission to make contact with the artifact. But it isn’t what anyone thought. Humanity faces a new kind of threat--and an event that will reveal a dark truth about our future.From A.G. Riddle, the worldwide bestselling author with OVER 4 MILLION COPIES SOLD, comes a sci-fi thriller that will forever change the way you look at Earth’s place in the solar system.Praise for A.G. Riddle“...reads like a superior collaboration between Dan Brown and Michael Crichton.”--The Guardian on Pandemic“I finished the book fast because I just couldn’t wait...”--WIRED GeekDad on Departure“Riddle... keep(s) the focus on his characters... rather than the technological marvels”--Publisher’s Weekly on Departure“Well-constructed and tightly-wound as a fine Swiss watch--DEPARTURE has non-stop action, an engaging plot and, of course, wheels within wheels.”--Diana Gabaldon, #1 New York Times bestselling author of OutlanderMORE ABOUT WINTER WORLDEach month, Earth grows colder. Snow falls in summer. Glaciers trample cities across North America, Europe, and Asia. The new ice age shows no signs of stopping.Chaos erupts. Around the world, people abandon their h