The detective in the story relocated from St. Paul to Fort Lauderdale because his wife wanted to experience humidity, which was unexpected. This move hints at a desire for change or adventure, contrasting their previous environment with the more humid, tropical climate of Florida.
"The detective had moved to Fort Lauderdale from St. Paul because his wife had inexplicably yearned to experience humidity." This quote highlights the odd, perhaps humorous motivation behind their relocation, setting a tone for the story's blend of unusual circumstances and character quirks.