The Gray Passenger is when death visits a ship. Exactly that has occurred when a former president of a South American country has been murdered on a ship sailing off the Carolina coast en route to South America. The political situation in that nation is explosive, spurring the FBI to send agents Erskine and Rhodes to investigate. Erskine is the lead investigator while Rhodes poses as a sailor. The FBI men face many dangers. The murder is part of a plot that involves piracy and political intrigue.
—Bill Koenig