"Toy Wars: The Epic Struggle Between G.I. Joe, Barbie and the Companies That Make Them", released in 1998, opened Miller's readers to the previously closed doors exposing the inner workings of toy manufacturing giants and Fortune 500 companies Mattel and Hasbro. In 2000, Miller published "King of Hearts: The True Story of the Maverick Who Pioneered Open Heart Surgery", an account of the men who created open-heart surgery focusing on Dr. C. Walton Lillehei. The popularity and success of Toy Wars would later lead to the opportunity to write "Men and Speed: A Wild Ride Through NASCAR's Breakout Season", in 2002, the result of Miller being granted unprecedented access to Roush Racing (now Roush Fenway Racing) during the 2001 season.