When a powerful CEO and his wife are shot to death in a deserted parking lot, the police investigate the husband's enemies. But Monk thinks it's all about the wife and the affair she was having with a handsome young ballplayer.
Jane represents a professional cheerleader who says she's being bullied by her teammates, Owen counsels a family to secede to protect their home from being seized by the government. Teri impersonates a lawyer to protect Paul.
Henry and Maggie attend party of a local publisher, where his son and stepson reenact a historical dual. Someone, however, has loaded the pistol with a real musket ball, so when son pulls the trigger, he kills his stepbrother.