The Significant Seven Jack Doyle Mystery Series, Book 1.

Seven lifelong friends and racing fans since their university days strike it lucky at Saratoga Race Track when they combine to win a million-dollar race. They use some of their profits to buy race horses, one of which, The Badger Express, turns out to be a sensational runner, stallion, and money maker. Then, years later, the men begin dying, one by one, targets of a professional assassin. The always irreverent Jack Doyle returns to the race track...