Danielle Flagey’s *Mal à penser, mal à être* investigates the psychological links between instrumental disorders and narcissistic vulnerability. Published in the Érès “enfances & psy” context, the book approaches these difficulties not merely as isolated symptoms but as signs of broader disturbances in thinking, bodily organization, and self-regulation. Drawing on clinical and psychoanalytic perspectives, it considers how problems with learned functions may reflect and reinforce difficulties in identity, desire, and relation to others. The work is aimed at clinicians and readers interested in child and adolescent psychopathology, psychoanalytic practice, and the intersection of learning disorders with narcissistic development. It offers a focused study of how psychic structure can shape the expression of instrumental difficulties and why therapeutic attention must address both cognitive functioning and the child’s subjective experience.