Prize-winning radio plays don't automatically make good theatre. And Shelagh Stephenson's sombre study of paternal abuse leaves many questions unanswered when exposed to the merciless examination of live performance. The situation is stark and simple: Janet and Susan, two women in their mid- 30s, shoot at point-blank range the father, Billy, who has sexually tyrannised them since adolescence. Over 80 minutes the play then backtracks to discover the source of Billy's cruelty and his wife's complicity. We learn of Billy's traumatic childhood and of his militaristic craving for order along with his wife's religiosity that leads her to identify with Christ's sufferings: abuse, Stephenson suggests, is a process with roots in the emotional deprivation of parents.

One can't argue with that. But her play is also based on the premise that society turns a blind eye: the fifth silence, beyond that of the characters, belongs to the local community. In the actual presence of the characters, questions arise. Where are the neighbours? Did the daughters never go out to work? The play, is set in the industrial north: not an area renowned for minding its own business.

The play is directed with quiet integrity by Ian Brown and well performed by a strong cast. Tim Pigott-Smith as the soliloquising Billy exudes a manic rectitude, Linda Bassett is his congenitally fearful wife and Gina McKee and Lizzy McInnerny convey the daughters' blank helplessness in the face of psychiatric questioning.

Until July 8. Box office: 020 8741-2311.