In the wake of the very public failures of the and the in 1999, NASA embarked on a complete reassessment of the Mars Program. Scott Hubbard was asked to lead this restructuring in 2000, becoming known as the "Mars Czar." His team's efforts resulted in a very successful decade-long series of missions—each building on the accomplishments of those before it—that adhered to the science adage "follow the water" when debating how to proceed. Hubbard's work created the Mars Odyssey mission, the twin rovers and , the mission, and most recently the planned launch of the . Now for the first time Scott Hubbard tells the complete story of how he fashioned this program, describing both the technical and political forces involved and bringing to life the national and international cast of characters engaged in this monumental endeavor.  Blending the exciting stories of the missions with the thrills of scientific discovery, will intrigue anyone interested in the science, the engineering, or the policy of investigating other worlds.