Malden only wrote one volume of ghost stories, and it is available to read in its entirety on the Project Gutenberg Australia website.

This G&S article by Richard Johnson provides some biographical details about Malden, as well as some commentary on his stories. More biographical information can be found at Wikipedia.

In the introduction Malden tells us that the manuscript that makes up most of The Sundial was found tucked inside a copy of this book, a biography of Archbishop John Williams.

It is hard to discuss The Sundial without repeatedly coming back to its clear inspiration, The Rose Garden by M.R. James.

This brief article explores the history of crossroad burials, as well as touching on the publics changing attitude towards suicide as a result of the death of Lord Castlereagh.

The unnamed author omits the location where The Sundial takes place, but provides enough small details throughout the story to fairly confidently identify Croxton Park in Cambridgeshire as the most likely real-world location. As with the house in the story, Croxton Park is 60 miles north of London, and close to a mainline railway station. The house was built around the same time mentioned in the story, and has the site of a medieval hamlet within its grounds. In the story the house lies between the villages of ‘Abbotsley’ and ‘Farley’. Croxton Park is bordered by Abbotsholme to the south west and Eltisley to the east. See here and here for more details on the history of the house and park, including historical maps.

There are many superstitions concerning Nightjars (or Goatsuckers, as they are sometimes called!). This is likely due to their nocturnal habits and unusual cry.

Malden doesn’t explain the exact motto that the narrator puts on his sundial, but this list of sundial mottoes will give you a flavour of the sort of thing that adorned ornamental sundials of the period.

At the conclusion of the story Parker, the ex-sergeant of marines and butler, purchases a picture of ‘King Solomon issuing directions to a corvée of demons‘. It is most likely a version of the picture in this article, which also list all 72 of the spirits/demons that King Solomon was said to have commanded!