Desperate to escape the "cold Swedish minds" of her homeland, beautiful Astree (Leander) falls under the enchanting spell of the Caribbean love serenade La Habanera and into the arms of Puerto Rican land baron Don Pedro de Avila (Ferdinand Marian). But ten years later, when Astree's old flame Dr. Sven Nagel (Karl Martell) arrives in Puerto Rico on an errand of mercy, all is far from heavenly. Astree is trapped in a loveless marriage to Don Pedro and the island wind that once conveyed the music of romance now carries death in the form of an outbreak of airborne tropical fever. While racing to find a cure for Astree's fever stricken son, Dr. Nagel most elude both the island authorities that would have him jailed for revealing their fatal cover-up and a psychotically jealous Don Pedro who would rather see Astree dead than reunited with her last love.