Kamila Shamsie’s latest novel is a riot of patterns. Raheen and Karim, friends, soulmates, completers of each other’s sentences. Placed spine to spine in babyhood by their parents, four close friends who neatly swapped partners one traumatic winter as Bangladesh sought severance from Pakistan. Destined to take stock of their shared burden — a tight braid of the mysterious events that secessionist winter that indelibly stained their parents’ futures, the ethnic mutinies now splintering their hometown Karachi, the fast unravelling double lives led by people like them — in 1995. Twenty-four years after Pakistan split in two, and forty-eight years after Pakistan itself was created.Patterns, in fact, are Raheen and Karim’s passion. Ordinary words and phrases are made sense of by being rearranged in anagrams. It keeps Raheen going through her suddenly lonely childhood, as Karim’s parents whisk him away from Karachi and its stray bullets to the relative safety of London. It helps her glue together the stories, minutiae of her life. Karim remains tethered to his moorings by opting for a bird’s eye perspective, by persisting with his childhood passion for cartography and making the mapping of Karachi a life-long pursuit.