P. M. Hubbard's main output was sixteen full-length novels for adults. These are typically suspense stories which have their settings in the countryside or on the coast of England or Scotland, although one, "The Country of Again", is set mainly in Pakistan. Most of the novels feature a male protagonist (although in some, such as "Flush as May" and "The Quiet River", the protagonist is a woman) and characters who in general are educated, articulate, and strong-willed. They draw extensively on one or more of the author's interests and preoccupations, including country sports, small-boat sailing, folk religion, and the works of William Shakespeare.