sondheimite2 said: "II think the reason it comes as such a shock to the audience (eliciting audible gasps) is that in addition to revealing Ray's lies, it is an incredibly stark reminder of just how YOUNG Una was when events unfolded between them. Until the arrival of the girl on stage, one can almost picture Una the way that Ray describes her, or even some of the ways she describes herself, but the whole time - throughout her riveting performance - we see an adult (albeit a broken one) in front of us. Seeing the girl compels the audience to remember that Una was just a kid when everything happened. It's a shocking and extremely effective moment for that reason."
I agree completely. Though the subject matter is so disturbing, as an audience member, you can't help but be drawn to the characters and their interpretation of the events. Then the stepdaughter arrives, and it's a gut punch to the stomach because it forces the audience to confront the visceral reality that Una was a CHILD and that NONE of this is okay.
It reminded me so much of Lolita - the prose is so seductive and effective, but at the end of the day you're following an unreliable account told by a pedophile abuser.