Kambanellis’ Letter to Orestes constitutes Clytemnestra's apologia for the murder of Agamemnon and is addressed to her estranged son Orestes. Until now, research has concentrated mainly on the content, verbal message and metatheatrical dimension of Clytemnestra's letter, laying emphasis upon Kambanellis’ intertextual links with the ancient Greek tragedies revolving around the Atreid myth. This article focuses attention on the dramatic form of the letter, examining it as a physical object with social connotations and as an active agent in the development of the events. It is argued that in emphasizing these aspects of the letter Kambanellis was probably influenced by the function of letters in two of the Greek tragedies which he clearly draws upon in The Supper trilogy: Euripides’ Iphigenia at Aulis and Iphigenia among the Taurians. However, Kambanellis’ intention was not to reproduce his tragic models but rather to exploit the medium of the letter in order to reconsider a staple of his own work: the disconcerting issue of human, and more particularly of familial, communication.