Marie has been married happily to Jean for over a quarter of a century, but one day, while on holiday, Jean goes for a swim in the sea never to return. Marie recovers from the loss of her husband but, despite the best efforts of her friends, she still refuses to truily believe he is dead. The movie's emphasis gradually becomes more philosophical, abstract and quietly macabre, a persuasive, intimate study of grief is transformed into a more general critique of romantic self-delusion in conventional marriage. Under the Sand is a beautifully observed and performed film, a delicate and haunting eulogy to the simplicity of true love.