A salesman for a major jewelry firm suffers a heart attack after his briefcase is stolen along with the $180,000 worth of uncut gems it contains. He is the fourth salesman for the firm to be robbed in recent months. Erskine begins to suspect that an inside man in the firm is telling the robbers who to hit, and he finds that a health club is the common link between the victims and the thieves.
—rbecker28