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ARE alarm bells going off at the 59E59 Theaters? They should be, since the playwright David Harrower has left a man and a woman alone on a stage there. The last time Mr. Harrower did this, in his Olivier Award-winning ''Blackbird'' (staged by the Manhattan Theater Club in 2007), the chemistry between his characters was so toxic that many of us who saw it still feel the burn. His current offering, opening on Thursday, has the ominous title ''A SLOW AIR.'' It is ostensibly a portrait of a relationship between a long-estranged brother and sister, played by Lewis Howden and Susan Vidler. But the play's scope turns out to range far beyond matters domestic. (The 2007 terrorist attack on the Glasgow Airport is a fulcrum of the plot.) Mr. Harrower has referred to ''A Slow Air'' as ''a Scotland play,'' which considers ''how the certainties with which people grew up have been challenged.'' The production is part of 59E59 Theaters' Scotland Week celebration, which also includes Gerda Stevenson's ''Federer Versus Murray.'' (And it is not, for the record, exclusively about tennis.) 59 East 59th Street, Manhattan, (212) 279-4200, 59e59.org; $35 (''A Slow Air'') and $25 (''Federer versus Murray''). [ABSTRACT FROM PUBLISHER]