While rummaging through family archives, filmmaker Guillaume Ribot discovers the notebook of an 11-year-old Jewish schoolgirl, Susi Feldsberg. In September 1942, two months after writing her last essay in this little notebook, Susi was deported and murdered in Auschwitz with her family. Hit by this unexpected discovery, Guillaume Ribot embarks on a journey across Europe in the footsteps of the Feldsberg family to understand and keep track of this broken destiny.