Written by Frederick Knott, adapted by Jeffrey Harcher directed by Jackson Gay. “Wait Until Dark” is the second best play Frederick Knott wrote (“Dial ‘M’ For Murder” is the best), but its one of the finest thrillers created for the stage. Susan has lost her eyesight in a car accident. She is married to a photographer, Sam. On a train back to New York he met a woman who managed to hide a doll in his luggage. She has come to their Greenwich Village apartment to retrieve it and has ended up dead. Her body is discovered elsewhere in the neighborhood the next day, and strange things start happening to their apartment and especially to Susan. That’s the base story of the play. The real story, or plot, is contained in the final fifteen minutes of the play, and, in the production currently playing at the Dorset Theatre Festival, those tense fifteen minutes are worth the ticket price and more.