When we first see the characters in Rona Munro's drama, they are dangling precariously from the side of a cliff. Grizzly, Dog and Gnome have been climbing together for years, ever since Grizzly's brother died of a cerebral oedema while attempting to reach the summit of a mountain. When Gnome is seriously injured on an expedition, Grizzly vows never to climb again if she survives. Will he - can he - hang up his ice axe for good?
Munro's richly pleasurable play is not just about the men and women who choose to slog their way up great lumps of rock and ice. It is also a subtle ode to friendship, and an exhilarating treatise on risk, obsession and death, invested with an understanding that we are only here for the blink of an eye.
With the help of Chahine Yavroyan's ethereally beautiful lighting, Roxana Silbert's luminous and haunting staging whisks us from mountaintops with views of cobalt blue skies to an intensive care unit and then back again. The production is awash with fine performances. Jan Pearson is wonderful as a widowed nurse who has put her heart in deep freeze. So is Garry Cooper as the old charmer Grizzly, a man slowly but surely digging his way out of an avalanche of grief.
· Until August 26. Box office: 0131-228 1404.
