Picture this: It's 2 a.m. on April Fools' Day, 1886. You're fast asleep in Key West when someone starts screaming "Fire!" outside your window. Within hours, downtown is basically gone—18 cigar factories, over 600 homes, and $2 million in damages (that's like $60 million today, just FYI). But here's the kicker: this wasn't just any fire. This blaze had all the makings of a spy thriller, complete...