The annual steeplechase races at Montpelier, once the home of James and Dolley Madison, are the high point in the social calendar of the horse-mad Virginians of cozy Crozet. The race meet offers a cracking good time with old friends and a chance to get even-on the racecourse-with old enemies. Postmistress Mary Minor Harry Haristeen will be in the thick of the action on this day of high spirits and fierce competition. But the glorious thoroughbreds and the pinks and greens and purples worn by the riders do not blind Harry to the dangerous undercurrents that start to surface. There's sure to be some emotional fireworks at Montpelier. Still, no one ...