What is the main conflict in Euripides V by Euripides?

In the opening pages of Electra, Euripides sets up the history of Agamemnon's death and the conflict of the story. Electra and Orestes have been wronged, and they seek revenge. The rightness or wrongness of this vengeance will be the central issue of the play. It is right for them to revenge the death of their father, but killing their mother is a serious and taboo act.