When Peter (Burt Grinstead) unexpectedly shows up at Kelly's (Laurie Okin) Lower Manhattan apartment, the mood is prickly and awkward. That's understandable; Peter is the identical twin of her husband, Craig, a hard-as-nails soldier who recently died in a military accident in Iraq. But during their conversation, many questions tug at this pair, threatening to bring them down into an emotional undertow. Did Craig really die in an accident? Why is Kelly's phone number unlisted and why is she obscuring evidence she may be moving out? Christopher Shinn's writing is sophisticated and elusive, presenting only tantalizing fragments and expecting you to make the connections and piece the backstory together. The language is raw and real — people really do talk this way — and Shinn, a Pulitzer Prize finalist for this play, perfectly captures the discomfort of a relationship that exists only through a marital connection yet becomes cathected and extremely complicated. Director Michael Peretzian stages the one-act play well, using lighting and sound cues sparingly but above all extracting superb and deeply expressive performances from his cast of two. Both actors are called upon to negotiate some difficult emotional terrain, and Grinstead, in particular, demonstrates his range.

Saturdays, 5 p.m.; Sundays, 7 p.m.; Mondays, 8 p.m.; Mondays, 8 p.m. Starts: June 1. Continues through Aug. 5, 2013

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