Barbara Dare's Roman Holiday (1987)

An Italian diplomat's son follows and seduces English lovers in Venice.

After Matt's dreams of a picturesque Italian wedding are shattered when his fiancée leaves him at the altar, he embarks on his planned honeymoon across Italy alone, immersing himself in the country's vibrant culture, food, and beauty, meeting Gia along the way.

An American girl on vacation in Italy finds an unanswered "letter to Juliet" -- one of thousands of missives left at the fictional lover's Verona courtyard, which are typically answered by the "secretaries of Juliet" -- and she goes on a quest to find the lovers referenced in the letter.

Four best friends take their book club to Italy for the fun girls' trip they never had. When things go off the rails and secrets are revealed, their relaxing vacation turns into a once-in-a-lifetime cross-country adventure.

Best-selling author Tyvian Jones has a life of leisure in Venice, Italy, until he has a chance encounter with sultry Frenchwoman Eva Olivier. He falls for her instantly, despite already having wedding plans with Francesca Ferrara. Winning Eva's affection proves elusive; she's more interested in money than in love. But Tyvian remain steadfast in his obsession, going after Eva with a fervor that threatens to destroy his life.

A successful businessman travels to Italy to arrange for the return of his tycoon father's body, only to learn that dear old dad died with his longtime mistress.

Harvard symbologist Robert Langdon is recruited by the Vatican to investigate the apparent return of the Illuminati – a secret, underground organization – after four cardinals are kidnapped on the night of the papal conclave.

Italian partisans help a professor sent by the OSS to find an atomic scientist held by Nazis.

A young man in a personal tailspin flees the US to Italy, where he sparks up a romance with a woman harboring a dark, primordial secret.

As a top student at St. Adeline's Catholic Boarding School, Zoe senses that something is not quite right about the school's new nun-- a sense proven to be true when it is revealed the "good' nun is an imposter with a fatal attraction to Zoe's brother.