Fathom is a slight departure from the first five Ben Bass Mysteries. This tale finds Captain Bass sailing in Western Caribbean waters in one of Windward Islands Bare Boats' thirty-seven foot sloops. It is also a factual look at the failed Bay of Pigs invasion and a review of the resulting, disastrous air battle. The real aerial combat that pitted modified WWII B-26 Marauders against Castro's high-speed, piston- and jet-engine fighters is covered, the losses are memorialized and a possible unintended outcome is added. The reader is taken back to those fateful days in 1961 when the world watched as a few thousand counterrevolutionaries struggled unsuccessfully to thwart the Fidel Castro's communist takeover of Cuba. These events are reviewed while an imagined outcome provides modern-day events in the Caribbean Sea. A leased sailboat is rammed and sunk, the ultimate fate of the crew is investigated, and Captain Ben Bass finds himself in the middle of another adventure.