The following link summarizes it best. However, in short, it is about an old man who waits for the waters to flow freely in a well that offers water that gives immortality to those who drink it. Cuchulain appears, and the old man tries to shoo him away. Cuchulain insists on staying, but is hypnotized by the Guardian of the Well, and he chases after a beautiful bird he imagines before him. The old man falls asleep at this point in time, and no one gets the water as it flows freely. The play stresses the "pointlessness of waiting for a dream."