Electra by Sophocles

Electra is a play written by the 5th-century BCE Greek tragedian Sophocles. Similar to Aeschylus' Libation Bearers, Electra focuses on the return of Electra's brother Orestes from exile and the plot to murder their mother. Years earlier, their mother Clytemnestra and her lover Aegisthus killed their father Agamemnon upon his return from the Trojan War. In this version of the story, Electra has been treated as a slave since the death of her father. She tries to procure the assistance of her sister Chrysothemis in her plot but fails. With the return of Orestes and his friend Pylades, Electra is able to successfully avenge her father's murder.