A hotel tycoon is electrocuted while climbing out of his swimming pool. A scrap of plaid cloth from a coat lining and a St. Christopher's medal are Burke's clues as he investigates the passengers on a round-the-world flight the tycoon was planning, including the lovely tour guide, a presidential candidate, the victim's drunken ex-mistress, a high-powered wheelerdealer and a fleeing embezzler. Just to make matters worse, Tim is attacked and kidnapped by a huge man and Burke is told that unless he lets the flight continue as planned, Tim will die.