In Sight Unseen radio drama, a genre traditionally dismissed as popular culture, is celebrated as high art. The radio plays discussed here range from the conventional (John Arden's Pearl) to the docudramatic (David Rudkin's Cries from Casement), from the curtly conversational (Harold Pinter's A Slight Ache) to the virtually operatic (Robert Ferguson's Transfigured Night), testifying to radio drama's variety and...