Samantha and Darrin are spending the day in Rome, touring the National Museum in their down time before Darrin has a lunch meeting with Larry and a client, Sig. Baldoni. Samantha and Darrin will then host a dinner for Sig. and Sig.ra Baldoni and Larry back at their villa in Pisa, the Baldonis who are staying with them for the entire weekend. At the museum, they encounter someone unexpected, namely Endora, who is concerned for Samantha as she believes Darrin, away from staid suburbia, will have more than a wandering eye being among the plethora of beauties that are the exotic Roman women. While Samantha balks at the notion, Endora secretly decides to put Darrin to the test by transforming the museum's statue of Venus, the Roman Goddess of Love, into human form - "Vanessa" - complete with her inherent love traits. Darrin, being a red blooded heterosexual male, is not immune to Vanessa/Venus' charms, and brings her back to the villa in the premise of having her work as their maid, despite the villa being equipped with its own domestic staff. Samantha can see immediately that Vanessa is other worldly. If Endora won't tell her, Samantha has to figure out exactly who Vanessa is. If Samantha can discover Vanessa's true identity, she will have to figure a way to combat Vanessa's charms before she overtakes the dinner with the Baldoni account going the way of the wind. Samantha's strongest weapon may be Vanessa's own counterpart.
—Huggo