Orpheus tries to save Eurydice……. :
Will Orpheus’ music enchant the Lord of the Dead, Hades?
Well, eventually, Hades is so stricken by the beautiful music Orpheus is playing, that he decides to give Orpheus a chance to save his wife, Eurydice, from the Underworld.
….. On one condition.
Orpheus must walk out of Hades (the Underworld), and trust that Eurydice is following behind him, but, if he falters in this trust, and he looks back at her to check, .. Eurydice, will sink back into the Underworld.
AND, that is exactly what happened.