An FSB officer falls in love with his agent, an American woman who works as a trader in a Russian bank.

Roger, a Luxembourgish writer, transforms the characters around him into fictional beings: playing with reality and fantasy, he makes his novel "d'Symmetrie vum Päiperlek", a poetic and dreamlike fantasy, when multicolored butterflies come to land on the chessboard of a rather gloomy daily life.