"You'll never leave me," teenager Jenna tells her best friend Suzanne. It seems that what she says is true such is the tight relationship of the quartet of young friends - no longer children but not yet adults - who meet by the pond and the old apple tree to stare at the stars and drink and take drugs. But happiness slips through fingers like water, and when one day Suzanne drops like an apple from the tree to the ground nothing can ever be quite the same again.
Imagine Wedekind's Spring Awakening crossed with Picnic at Hanging Rock and throw in a touch of Abi Morgan's Tiny Dynamite and you have a flavour of Stars, a first play by young German writer Anja Hiling which charts the loss of innocence and that moment when you are growing up when you discover the worm in the apple. You carry the bitter knowledge around with you for the rest of your life.
The message that we are all alone - light years from each other like the stars - may be a hard one, but it is delivered here with oodles of charm by a young cast, even if the elliptical nature of Hiling's writing and an unevenness of tone in Kate Nelson's production means that the piece remains frustratingly insubstantial.
· Until August 27. Box office: 0131 228 1404.
