Place: Sparta and the shores of the sea
Time: Before the Trojan War.

Act 1
Paris, son of Priam, arrives with a missive from the goddess Venus to the high priest Calchas, commanding him to procure for Paris the love of Helen, promised him by Venus when he awarded the prize of beauty to her in preference to Juno and Minerva.

Paris arrives, disguised as a shepherd, and wins three prizes at a "contest of wit" (outrageously silly wordgames) with the Greek kings under the direction of Agamemnon, whereupon he reveals his identity. Helen, who was trying to settle after her youthful adventure and aware of Paris's backstory, decides that fate has sealed her fate. The Trojan prince is crowned victor by Helen, to the disgust of the lout Achilles and the two bumbling Ajaxes. Paris is invited to a banquet by Helen's husband Menelaus, the king of Sparta. Paris has bribed Calchas to "prophesise" that Menelaus must at once proceed to Crete, which he agrees to reluctantly under general pressure.

Act 2
While the Greek kings party in Menelaus's palace in his absence, and Calchas is caught cheating at a board game, Paris comes to Helen at night. After she sees off his first straightforward attempt at seducing her, he returns when she has fallen asleep. Helen has prayed for some appeasing dreams and appears to believe that this is one, and so resists him not much longer. Menelaus unexpectedly returns and finds the two in each other's arms. Helen, exclaiming 'la fatalité, la fatalité', tells him that it is all his fault: A good husband knows when to come and when to stay away. Paris tries to dissuade him from kicking up a row, but to no avail. When all the kings join the scene, berating Paris and telling him to go back where he came from, Paris departs, vowing to return and finish the job.

Act 3
The kings and their entourage have moved to Nauplia for the summer season, and Helen is sulking and protesting her innocence. Venus has retaliated for the treatment meted out to her protégé Paris by making the whole population giddy and amorous, to the despair of the kings. A high priest of Venus arrives on a boat, explaining that he has to take Helen to Cythera where she is to sacrifice 100 heifers for her offences. Menelaus pleads with her to go with the priest, but she refuses initially, saying that it is he, and not she, who has offended the goddess. However, when she realises that the priest is Paris in disguise, she embarks and they sail away together.