Philip Hensher’s new novel is set in Dhaka (then Dacca) in 1971, when East Pakistan fought West Pakistan to become an independent nation, Bangladesh. The narrator, a Bengali boy named Saadi, describes the two countries. “To the left was West Pakistan, where they ruled, and spoke Urdu, and wrote in an alphabet that flowed like water under wind. To the right was East Pakistan, where the Bengalis lived. They spoke Bengali, which chatters like a falling xylophone, and is written in an alphabet that looks like a madman trying to remember a table’s shape.”