"""For lovers of Andy Weir's The Martian, here's a true hard-science-fiction tale set on the red planet--a terrific blend of high tech and high tension, of science and suspense, of character and crisis."" -- Robert J. Sawyer, Hugo Award-winning author of Red Planet Blues ""Post-apocalyptic disaster meets fractured utopian space exploration in this terrifying tale, which Cawdron (Anomaly) sets in a scientific outpost on Mars . . . This tense cat-and-mouse game plays off fears . . . to satisfying result."" -- Publishers Weekly ""Science fiction as it should be. Retrograde combines realistic characters with depictions of Mars as our explorers will one day find it in a powerful story. A must-read!"" -- Ben Bova, Hugo Award winner and author of the Grand Tour series"