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Welcome to The Show! On Tuesday, David Walsh, author of "From Lance to Landis: Inside the American Doping Controversy at the Tour de France" will stop by to chat.

Walsh, an award-winning journalist, explores the shadowy side of professional cycling. He investigates the doping scandals that have hit the sport both in abroad and in the United States. He looks into how and why world class athletes use erformance-enhancing drugs in one of the world's most premiere sporting events - the Tour de France, which starts this year on July 7. To read an exerpt from the book, go here. To buy the book, go to Amazon.com. The book hits the book stores on Tuesday.

Send your questions now and join Walsh in The Show on Tuesday at 2 p.m. ET!

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