Three-time Olympic athlete Suzy Favor Hamilton seemed to have it all: a highly decorated running career, numerous high-profile corporate sponsorships, a marriage to her college sweetheart, and a healthy young daughter. So what would lead her to a shocking double life as a high-priced Las Vegas prostitute? In her first broadcast interview tied to the release of her memoir Fast Girl: A Life Spent Running From Madness, Suzy speaks exclusively to Elizabeth Vargas about the self-doubt she harbored for years and what fueled her high-risk behavior and secret life. Vargas also speaks to Hamilton's husband, Mark, who not only knew about her life as an escort but stood by her side.