Certainty is a wonderful thing. It gives you something to cling to, just as the drowning survivors of a shipwreck cling to a log. For 27 years since they moved to their little house in a New Jersey suburb, Frank and Emily Gulick have been full of certainty. They have been certain that God exists, their neighbours are good people, capital punishment is an excellent thing and tomorrow will be very much like today. But one day the certainties begin to crumble with the discovery of the body of a 14-year-old neighbour in the Gulicks' basement. With their son Carl arrested for the crime, the Gulicks cling to one last certainty - his innocence.
Deceptively simple, this clever engrossing little show puts small town, homespun America in the dock as the increasingly bewildered Gulicks subject themselves to an existential televised grilling about the nature of American civilisation and the American dream. Soon the Gulicks are revealing as much as they hide as they unwittingly discover that when you take one brick out of the building the entire edifice totters and crumbles.
A bare 45 minutes long, this is a far more penetrating dissection of self-deception, the treachery of memory and the state of the American psyche than many shows twice its length and Neil Doherty's production is tight, exquisitely measured and brilliantly acted by Benny Young and Deirdre Murray.
· Until August 27. Box office: 0131 228 1404.
