The Moving Finger

Lymstock was a town with more than its share of shameful secrets - a town where even a sudden outbreak of anonymous hate-mail caused only a minor stir. But all of that changed when one of the recipients, Mrs Symmington, committed suicide. Her final note said 'I can't go on'. Only Miss Marple questioned the coroner's verdict of suicide. Was this the work of a poison-pen? Or of a poisoner?