Conrad, Barnaby Last Boat to Cadiz.
Totally implausible (but fun reading!) waning days of World War 2 Spanish setting with Nazi bad guys (Martin Bormann among them), having just escaped the inferno of Berlin’s last days, attempting to make a rendezvous with a German U-boat waiting for them off the coast of Spain. An American Vice-Consul based in Seville stumbles in on the action in that supposedly neutral city and is forced to accompany the Germans aboard a small ferry (the fictitious CAYETANA) sailing down the Guadalquivir River to Cadiz. Also aboard are a “ship of fools” assortment of other American passengers which make for a pulp fiction voyage that’s a fast read. Save this one for that trip to the beach next Summer!