Sonny is just 18, taken his A levels and has just got involved in animal rights. His 22-year-old sister, Anita, is a brilliant scientist who is going to work at a new laboratory for animal testing. The stage is set for a clash of values in which the children's mother and her new boyfriend get caught in the middle and the stakes are raised by the fact that Sonny is an asthmatic - a condition which many people don't realise can be a killer.
Judith Johnson has always been a writer who is unafraid to tackle knotty social issues, but the problem with this skimpy play is that it feels like what it is: a tool to encourage debate rather than a fully fledged theatrical experience.
After the performance the audience is invited to stay for a discussion. This is very much drama not theatre and both the production - there is an absurd scene where the family eats real salad but doesn't touch a real quiche - and most of the acting is rudimentary, although Nadia Kamil's Anita demonstrates real passion and impatience with her little brother. Issue-based plays may have their place in the classroom, but regrettably this doesn't earn its place in a theatre.
· Until Aug 28. Box office: 0131 226 6522
