Every marathon has two lines. We usually focus on the Finish Line; that is where the crowd gathers, that is where medals are awarded. We see crossing the Finish Line as the victory. But there is a second line: the Starting Line. Sometimes, getting to that line and crossing it is even harder. Once you do, though, life can get pretty amazing. William Thomas only began running at age 42, and ran his first marathon nine months later. Looking for a new goal, he set out to complete The Marathon Grand Slam: running a marathon on all 7 continents and at the North Pole. In addition to running marathons in the United States, his Grand Slam journey took him to Singapore, France, Brazil, South Africa, Australia, Antarctica, and ultimately, the North Pole. CROSS THE LINES is the story of the multi-year journey that put him onto a very different path from anything he could have imagined before. CHAPTER 1: The Starting Line CHAPTER 2: 26.2 Lessons From Running Marathons CHAPTER 3: North America -- Marine Corps Marathon CHAPTER 4: Asia -- Standard Chartered Singapore Marathon CHAPTER 5: Europe -- Paris Marathon CHAPTER 6: South America -- Rio de Janeiro Marathon CHAPTER 7: Africa -- Cape Town Marathon CHAPTER 8: Australia -- Blackmore's Sydney Marathon CHAPTER 9: Antarctica -- Antarctic Ice Marathon CHAPTER 10: North Pole -- North Pole Marathon CHAPTER 11: No Finish Line In Sight