what is the uniqueness of Murder in the Cathedral?

What Eliot created in the play was a mixture of theology and tragedy. The play is set solely around Canterbury in the days after Thomas returned from seven years of exile in France. Though based around historical record, the play eschews psychology and political interpretations in favor of a more serene and spiritual consideration of the sacrifice of martyrdom. Written to be performed in the actual Cathedral, the entire experience is sculpted to mirror the experience of a Mass, even giving the actor playing Thomas a sermon during the Interlude that he would have preached alone at the pulpit.