My newest novel, "Russet," has just been released. It's a 600-page saga about mounting a mission to Mars, an unimaginably complex undertaking. Sending astronauts to the Moon took four days; Mars is a one-way journey of at least five months. How could we possibly build a ship large enough and safe enough to accommodate their needs, for a round-trip journey of at least 18 months? In my story, NASA has the answer—an extraordinary plan to put 30 people on the Red Planet—unless those who oppose the mission can destroy the ship first.