Avila, a rancher, is being threatened by an extortionist, who wants $200,000 or else he'll spread the virus for hoof-and-mouth disease throughout Avila's herd. The extortionist is being driven by jealousy, hate and bigotry. Erskine and Rhodes seek the extortionist's identity. Avila doesn't realize the threat is closer than he thinks.—Bill Koenig