When she was 19, she was aboard her father’s ship in Havana Harbor when two boats approached, filled with bearded men dressed in military uniforms. One of them caught her attention. “His face fascinated me,” she writes. This was the face of Fidel Castro, who only a month before had taken over Cuba from Fulgencio Batista in the famed 26 of July Revolution. “I will never forget the first time I beheld that penetrating stare, that beautiful face, that wicked and seductive smile,” she writes.

“I am Dr. Castro,” he said. “Fidel. I am Cuba. I have come to visit your large ship.”

The two exchanged glances, and mere moments later, they embraced in her cabin belowdecks — the start of an affair that would change the course of her life. He called her Alemanita — “Little German Girl” — and as soon as she returned to America, he sent a private plane to collect her. She stayed in Cuba with him for seven months, in his suite at the Havana Hilton.

“He was a good lover and a good smoocher,” Lorenz told The Post. “He liked to hold hands and hug a lot.”

She soon became pregnant, she claims, and Castro seemed happy. But when she was seven months pregnant, while Castro was away on a trip, she believes someone slipped a drug into her milk and when she awoke, the baby was gone and she was alone in a dark hotel room, terrified.

She says she quickly returned to the United States, furious at Castro and bereft at the loss of her child. She had no way of knowing what happened to the baby — whether it had been delivered or aborted.

The FBI soon visited her and used her anger to their advantage. An agent named Frank Sturgis, whom she’d met in Cuba (the spy who would later be arrested during the Watergate break-in), recruited her to take part in a plot to assassinate her former lover. She was sent back to Cuba to reunite with him, carrying two botulism-laced pills that could kill the general in minutes, she was told.

But when they reunited, Castro immediately knew why she was there. In dramatic fashion, he took his gun out of its holster and handed it to her, almost taunting her, she claims.

“No one can kill me. No one. Ever,” he said. He was right. She didn’t do it, instead dumping the pills into the bidet. She says she never had any plans to kill the father of her missing child anyway. They made love, he left, and she returned to the United States.