A Chinese-American woman hires Perry Mason to locate a valuable collection of diamonds missing from her grandfather's Hong Kong residence.
Arch-criminal Tiffauges has been run out of New Orleans and is passing through North Fork with his entourage. Spotting the McCain ranch, he decides it would make a ranch for himself and tells McCain he wants to buy it. When Lucas says it's not for sale, Tiffaughes threatens harm to Mark unless he gets the ranch.
In defending a young man charged with murder, a female lawyer friend of Perry's simultaneously clears her dead husband's name of suspicion and helps her client take the first step toward redemption.
A shepherd ignores the Cartwrights' warning not to drive his flock across the Ponderosa; guest Everett Sloane.
Jennifer Beale is abducted in the hopes her rich father, Joshua, the richest silver baron on the Comstock, will pay a $1M ransom. The plan unravels when the beautiful Della is killed and Hercules, who loves her, finds out who did it.