Veterinarian Jessie Cameron agrees to fill in for her mentor, Doc Lewis, at Riverview Racetrack so he can take a long-overdue vacation. When he's tragically killed by one of his equine patients the night before he's supposed to leave, Jessie quickly suspects the death is anything but accidental. Her search for the truth is thwarted by everyone from well-meaning friends to the police, including her soon-to-be-ex-husband. Undaunted, she discovers layers of illegal activities and deceit being perpetrated by the man she thought of as a father figure, creating a growing list of suspects with reason to want Doc dead. Too late, she realizes that her dogged quest for the truth has put her in the crosshairs of a devious killer desperate to silence her. Permanently.