On the picturesque streets of Milan—where you can easily get lost in a labyrinth of houses, restaurants, and feelings—the action of Marco Missiroli’s novel “Fidelity” unfolds. Carlo loves his wife very much. But his student, Sophia, has tender dimples on her cheeks—and Carlo can’t stop thinking about her. Margherita loves her husband dearly. But her physiotherapist, Andrea, has such strong hands—and Margherita can’t stop thinking about him. In longing, confessions, fears, and betrayals, they try to forge their lives, which sometimes seem meaningless, complicated, and frightening. What does each of them truly want? And can they preserve fidelity to themselves?