Sibérie follows a couple, actress Joana Preiss and filmmaker Bruno Dumont as they travel the Trans-Siberian Railway, filming each other with small cameras. Blurring documentary and fiction, the film turns the journey into an intimate exploration of their relationship, where conversations about love, desire, and cinema reveal emotional tensions. Less a travelogue than a self-portrait of a couple, Sibérie uses the voyage to probe intimacy and the fragile boundary between life and filmmaking.