The 'Da' in 'Da' is the recently deceased foster father of a 40 year old Irish playwright Charlie, who now lives in New York and has returned to Ireland for his father's funeral. Da, in typical Irish style, can't bear to miss his own funeral. As Charlie sorts through the old man's papers, burning most of them, who strolls in but Da himself. Shocked, Charlie reminds him that he is dead and tells him to "get out of my head". Most of the action takes place in Charlie's mind and memory, moving from present reality to the past and back again, as the two struggle to understand each other. In the process, other significant and colourful characters of Charlie's early life are resurrected, including his mother, the family dog and his tyrannical employer. His reverie is interrupted by Mr. Drumm, who was entrusted with Da's will, which much to Charlie's dismay bequeaths everything to him, including all of the money Charlie ever sent his Da. Charlie learns that he cannot exorcise the past. Like all mankind, he is part of a human chain and to reject his father, even in memory, is to deny himself.