This work is an account of one of the most thrilling topics in science - the search for life on Mars - and how it may ultimately lead us to the origins of life in the universe. Hidden beneath the sterile surface of Earth's neighbouring planet may be the keys to unlocking the origins of life in the universe. An expert on extreme-life environments, Malcolm Walter argues that the best place to find evidence of life on Mars is in the rocks and subsurface water of the Red Planet - out of reach of telescopes and space probes. In this book, Walter unveils his dramatic plan - already adopted by NASA - for finding these elusive traces of life.