Higgins' half brother, an Irish Catholic priest from Northern Ireland, arrives in Hawaii to confront a British officer who he claims stole an ancient artifact from his church.

Magnum joins forces with a hard-nosed private eye from St. Louis whey they find themselves investigating the same case but from opposite ends of the spectrum.

Magnum does not count on murder when he chaperones Rick's convent-school sister on a night on the town.

Magnum decides to investigate the mystery surrounding Higgins' sudden departure from Robin's Nest.