The smart summer movie for adults used to be enough of a rarity in the era when people were going to the movies all the time. Now that many people are used to, and often prefer, watching at home, it has virtually disappeared. And yet, inching in just under the late-summer wire, here comes Jay Roach ’s jaunty black comedy The Roses, in which Benedict Cumberbatch and Olivia Colman play Theo and Ivy, a well-off middle-aged couple whose marriage hits the skids. Whether you find a comedy about a couple falling apart comforting or upsetting may come down to temperament; The Roses , with its thorny pleasures, may not be everyone's idea of a fun night out. Even so, Roach and his actors get at certain truths about couplehood that apply to even the most well-matched lovebirds. You can of

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