In Playing Through the Pain, writer Dan Good seeks to make sense of MLB MVP Ken Caminiti's fascinating, troubled life. Good began researching Caminiti in 2012 and conducted his first interviews for his biography in 2013. Since then he's interviewed nearly 400 people, providing him with an exclusive and exhaustive view into Caminiti's addictions, use of steroids, baseball successes, and inner turmoil. Decades later, the full truth about Major League Baseball's steroids era remains elusive, and the story of Caminiti, the player who opened the lid on performance-enhancing drugs in baseball, has never been properly told. Caminiti voluntarily admitted in a 2002 Sports Illustrated cover story that he used steroids during his career, including his 1996 MVP season, and guessed that half of the players were using performance-enhancing drugs. Good's on-the-record sources include Caminiti's steroids supplier, who has never come forward; people who attended rehab with Caminiti and revealed the secret inner trauma that fueled his addictions; hundreds of Caminiti's baseball teammates and coaches; childhood friends who were drawn to his daring personality, warmth, and athleticism; and the teenager at the center of Caminiti's October 2004 trip to New York City during which he overdosed and died.