Lessons of a teacher's sad affair

Fiona Evans's two-hander is short, sweet and perfectly formed - unlike the relationship it describes, between Lauren, a 29-year-old gym teacher and Darren, one of her pupils.

As he is about to turn 16, they spend the weekend together in a seedy Scarborough B&B, and we realise that their relationship has been sexual for some time.

With an admirable economy of words - always believable - Evans explores the shifting dynamics of a doomed affair. She is brave enough to suggest that it's not just Darren who is vulnerable here, with hints at why Lauren is taking such appalling risks with her career and reputation.

The set, by Jo Newberry, in a tiny space usually used as a storeroom, is brilliant; all peeling wallpaper, scabby carpets and horrid plastic bathroom fittings, and the audience of just 20 sit on the floor and hug the walls as the action takes place inches from them.

This gives the experience an added intensity under Deborah Bruce's direction and there are two superb performances from Holly Atkins and James Baxter. This is the kind of work - heartfelt but uncommercial - that defines the Fringe experience. A rare treat.

Until 27 August: Information: 0131 623 3030, www.assemblyfestival.com.

Scarborough
Assembly @ George Street, Edinburgh Festival