The sisters Caroline von Beulwitz and Charlotte Lengefeld are inseparable. Even when both fall hopelessly in love with the same man over a hot summer – the famous poet Friedrich Schiller. The beautiful Caroline is unhappily married, while the shy Charlotte longs for a husband. Schiller, who is captivated by the two very different sisters, cannot make a decision and suggests a ménage à trois. The close bond between the sisters is put to a severe test...