The heroine of Julian Davies’s fifth novel, The Boy, which is set in New York in 1956, is a nightclub singer originally from Australia. The boy of the title, almost half her age, is Zimzam Taylor. They are both outsiders. Marian’s life in New York is a kind of exile, in which she is closest to those she has left behind, such as her painter-husband André and her insistent, disapproving aunt Flavia, whom she left behind on the estate outside Canberra in order to sing in wartime London. Zimzam, as she learns when she picks him up and takes him back to her hotel, is an orphan whose family died in a fire. Now he is a creature of the city: