"Ηλέκτρα" by Euripides is a tragedy written in the mid 410s BC. Electra, married off to a poor farmer to prevent noble heirs, joins her exiled brother Orestes in a plot to avenge their father Agamemnon's murder. Their targets are their mother Clytemnestra and her lover Aegisthus, who killed Agamemnon years earlier. As the siblings execute their plan, questions arise about heroism, morality, and the cost of vengeance, culminating in acts that bring both justice and profound guilt.
Wikipedia page about this book: en.wikipedia.org/wiki/Electra_(Euripides_play)) Wikipedia page about this book: el.wikipedia.org/wiki/%CE%97%CE%BB%CE%AD%CE%BA%CF%84%CF%81%CE%B1_(%CE%95%CF%85%CF%81%CE%B9%CF%80%CE%AF%CE%B4%CE%B7))