Robert d'Eglantine, a video game designer, specialist in quantum physics, invites friends in his castle lost in the countryside to share an experience ... According to his calculations, at 23:37, a fault will open in the space continuum -time, and will project them 70 years back, in May 1944, in full German occupation. Role play scholar or real time travel? The events that will take place during their stay could change the course of time ...