Mrs Manson (a black comedy)

MRS MANSON (a black comedy)
Mrs Manson tries to relieve the boredom of her twilight years with some subtle cruelty to her terminally daft sister, dreaming up a multitude of deaths for Mrs Preedy's ginger tom, stealing cream cakes and attempting to cure a medium of hiccups with disastrous consequences. 

You can buy it here from Amazon for the Kindle.