Alexander Pushkin was brought to ruin by his letters more than once. When the Russian postal police intercepted a letter suggesting that atheism was ‘the most plausible’ philosophy, he was exiled to his mother’s bleak estate in the rural north-west. But his own temper was far more dangerous. In the autumn of 1836, he received a series of anonymous letters taunting him about his coquettish wife’s affair with George-Charles d’Anthès-Heeckeren, a French officer and the adopted son of the Dutch ambassador.