And if White's text doesn't shine any new light on the subject, the play is engaging enough when matched with Daniel Sullivan's handsome, mostly well-acted production, featuring distinguished visuals by John Lee Beatty (set), Jane Greenwood(costumes) and Japhy Weideman (lights)...Unfortunately, Mary-Louise Parker's wispy and underwhelming performance lacks the necessary depth, often speaking too quickly and softly to be understood. Far more strength and craft is displayed by Victoria Clark as her pragmatic and devout sister, Clarissa, and Danny Burstein as Clarissa's thickly accented German husband, a doctor keeping Elizabeth on medication to sooth her depression.