Nicholas Foxton, a former jockey who suffered a career-ending injury, is out for a day at the Grand National races when his friend and coworker, Herb Kovak, is murdered right in front of him and 60,000 other potential witnesses. As he struggles to come to terms with Kovak's seemingly inexplicable death, Foxton begins to question how well he knew his friend. Was the murder a case of mistaken identity or something more sinister?