‘The unsent letter, as [Caroline] Atkins shows in her enjoyable range of examples,’ writes Frances Wilson on What a Hazard a Letter Is in her long review in the TLS of books about letters and letter-writing, ‘has a thrilling, virgin quality. It is by turns a non-event, a near-miss, a relief, a tragedy, a possibility, a loss, a gain, a potential, a deprivation and a spoilt story. The unsent letter also has an excess of immediacy and authenticity, which is usually why it is unsent.’