It began with an Oread who lived on Mount Cithaeron. She had one sibling (Nymphs) and two children (lynx and lambe). Zeus loved beautiful nymphs and visited them often on Earth.
Climax
Zeus's wife, Hera, eventually became suspicious about an affair between her husband and Echo. She wanted to find out for herself if anything was going on.
Falling Action
Hera had come from Mount Olympus in attempting to catch Zeus with the nymphs.
Resolution
Hera put a curse on Echo for her to only be able to speak the last words spoken to her.
After the curse, Echo met Narcissus and fell in love with him but was unable to speak her feelings towards him.
Narcissus rejected Echo and fell in love with himself.