Spanish writer Javier Marías’s newest novel, The Infatuations (352 pages; Knopf)—wonderfully translated by Margaret Jull Costa—is a heady, noir-tinged trip deep inside the consciousness of María Dolz, a book editor who finds herself dragged into the dangerous drama of a couple she is obsessively observes from afar. When the novel begins, María describes how she has come into the habit of watching Miguel and Luisa, “The Perfect Couple,” as she terms them, while she eats breakfast near them in a café. She quickly finds herself dependent on the couple’s presence for her happiness; she needs their stability and the perfection […]