In the therapeutic world of Symbiosis, a workshop for personal growth that is still being developed, a dozen test subjects in their early thirties are brought together. During these experiments, physical aggression is encouraged in order to overcome the contradictory forces that coexist within each person. Based on the premise that each person is his or her own worst enemy, this form of art therapy promotes supervised partnerships between the trainees, aiming to explore their positive strengths in order to achieve recognition of their self-destructive instincts and reconciliation with themselves. However, this programme is compromised by the death of Michael Ropa, one of the participants, who is found brutally murdered on the workshop premises.

Through a detective story in which the main characters are suspected of murder, this novel tells the story of two brothers, Alex and Jay-Rémi, who were separated as teenagers and who meet again around the memory of a mysteriously suppressed childhood. Through the eyes of Alex, a visual artist trapped in the violence that runs through his work, Symbiose depicts the distorted relationships that unite members of a struggling generation in their quest for light and salvation.