In Dublin, Niall, a young mailman, discovers the diary of Fiona Walsh, a recent murder victim, in the dead-letter bin at the post office. Upon reading the diary, Niall immerses himself in the enchanting mystery of traveling Irish storyteller Jim, who entered Fiona and her sister's life, wooing them with his tragic narratives. As Niall reads, though, he connects Jim to a string of murders throughout Ireland and commences a dangerous hunt for the wicked raconteur, desperate for the truth.