The arrival by sea of a large crate destined for Robin Masters leads Magnum into a bizarre situation involving a wealthy Japanese businessman, his errant daughter and a fortune in pearls.

When a valuable artifact entrusted to a modern day Samurai warrior is stolen, Magnum becomes involved in a culture and a way of life that hasn't altered in centuries.

Susan Johnson (played by Carol Burnett) is a bank teller who, desperate to hire Magnum, locks the two of them in a time-released bank vault.