Abstract: This article is based on the multibiography of Maurice Serra, Les Frères séparés (Paris, 2008), in order to analyse dandyism in the political novels published in the 1930s by André Malraux, Pierre Drieu la Rochelle, and Louis Aragon. It assesses the reciprocal echoes, readings, and criticisms between these three “brothers” and shows how the dramatisation of dandyism leads to a reflection on the links between engagement and writing, and the value of literature.