Described by one surgeon as "soul-crushing, diamond-making stress," surgery on congenital heart defects is arguably the most difficult of all surgical specialties. Drawing back the hospital curtain for a unique and captivating look at the extraordinary skill and dangerous politics of critical surgery in a pediatric heart center, Michael Ruhlman focuses on the world-renowned Cleveland Clinic, where a team of medical specialists--led by idiosyncratic virtuoso Dr. Roger Mee--work on the edge of disaster on a daily basis. Walk on Water offers a rare and dramatic glimpse into a world where the health of innocent children and the hopes of white-knuckled families rest in the hands of all-too-human doctors.