In 429 BCE, Euneas was sent by Myrrine to Paros on a diplomatic mission for a peace talk with the island polis. Upon arrival however, he and his men were ambushed by a number of Parian soldiers. While Euneas' men were slaughtered, he was captured and taken to the Fortified Marble Quarry. As Euneas failed to return, Myrrine sent her daughter Kassandra to locate his whereabouts and return him home.
Within the remains of Euneas' ship, Kassandra found one of Euneas' men alive, who informed Kassandra of the Parian attack and the capture of his superior. Kassandra subsequwently travelled to the quarry and freed Euneas, bringing him to safety.
After they reached safety, Euneas informed Kassandra of the things he observed on the island, including witnessing a meeting where one of the people present had worn a mask unlike any he'd seen before. With that, Euneas and Kassandra parted ways, and Euneas returned to Myrrine to tell her what he'd seen.