"searching for a lost Eurydice"

In Greek myth, Eurydice was the wife of the musican Orpheus. When she died, Orpheus was given permission to travel to the underworld to find her. He was allowed to lead her back to the world of the living on the condition that he didn't look around to see her following him until they left Hades. However, just as they were leaving, he succumbed to temptation and looked around, and she vanished back into the world of the dead.