This vital and risk-taking suburban Equity house, efficiently run by artistic director Eileen Boevers and production manager Tim Stadler, has launched many terrific shows. Typical fare features new and established musicals ("Anna Karenina," "Falsettos," "The Rothschilds," "The World Goes Round," "Ain't Misbehavin'") as well as controversial plays (the abortion drama "Keely and Du"; "Three Hotels," an attack on corporate indifference to Third World countries; "Not About Heroes," a tragic look at the relationship between World War I poets Siegfried Sassoon and Wilfred Owen). More recently, the theater has featured Donna Blue Lachman in two stunning solo performances, a powerful revival of Henry James' "The Heiress," "Blade to the Heat" (a torrid drama about a gay Puerto Rican prize fighter), "Kindertransport" (an ambivalent look at a Holocaust rescue effort), and "Nine Armenians," the second play at Apple Tree to depict the struggle of Armenian immigrants to forget the 1915 massacre by Turkish forces.