Where did we borrow the title?
Probably a better book :-\An allegation should be based on something besides a whim.The Cubans have an Embassy in Mexico City.
A whim? The reported threat was based on statements allegedly made by Castro himself to a important US double agent, Jack Childs. Childs and his brother, Morris, were top members of the CPUSA and were highly trusted by the Soviets and Cubans. These were not oddballs. They were top agents.
At the time of the alleged incident the Cubans had both a consulate building and an Embassy. According to the Cubans - Duran, Azcue, Mirabal - the encounter took place at the Consulate. That was where visa applications were processed.
And what does Crenshaw know about Oswald and Mexico City?