Ivan et Peter, deux frères que les années ont éloignés, se retrouvent à la mort de leur père. Ivan, vingt-deux ans, est un brillant joueur d'échecs, ultrasensible et solitaire. Peter, juriste renommé de Dublin, est un trentenaire aux multiples conquêtes. Tous deux vivent des amours périlleuses pendant ce moment délicat du deuil, intermède de vie où la fragilité n'exclut pas l'aventure. Avec Intermezzo, l'Irlandaise Sally Rooney signe un nouveau roman sensuel et fascinant dans la veine de Normal People, où les personnages se mettent à nu, les couples se font et se défont dans une délicieuse confusion des sentiments.

Aside from the fact that they are brothers, Peter and Ivan Koubek seem to have little in common. Peter is a Dublin lawyer in his thirties - successful, competent and apparently unassailable. But in the wake of their father's death, he's medicating himself to sleep and struggling to manage his relationships with two very different women - his enduring first love Sylvia, and Naomi, a college student for whom life is one long. Ivan is a twenty-two-year-old competitive chess player. He has always seen himself as socially awkward, a loner, the antithesis of his glib elder brother. Now, in the early weeks of his bereavement, Ivan meets Margaret, an older woman emerging from her own turbulent past, and their lives become rapidly and intensely intertwined. For two grieving brothers and the people they love, this is a new interlude - a period of desire, despair and possibility - a chance to find out how much one life might hold inside itself without breaking.