As Hercule Poirot sifts through his post one particular morning, he alights upon a letter from an elderly and (as it transpires), exceedingly rich spinster - Miss Emily Arundell. She is clearly in great distress and seeking his help, but doesn't say why. Her only specific mention is 'the incident of the dog's ball'.
In Venice, Frances Croy is working to leave the previous year behind: another novel published to little success, a scathing review she can't quite manage to forget, and, most of all, the real reason behind her self-imposed exile from London: the incident at the Savoy. Sequestered within an aging palazzo, Frankie finds comfort in the emptiness of Venice in winter, in the absence of others. And then Gilly appears.