According to Aristotle's theory disseminated in The Poetics, the tragic hero should be a man with a towering personality who, due to a certain tragic flaw, undergoes some sort of transformation from prosperity to adversity, which leads to his tragic downfall. This paper explores the moral decline of Alexander, the protagonist of Terence Rattigan's play Adventure Story in the light of Aristotle's concept of the tragic hero and within the context of the play itself