Malcolm Torrie Biography - Information About the Author
Malcolm Torrie is a pseudonym of Gladys Mitchell and as such the books are very collectable.
Despite the fact the books are relativley modern they are scarce, modest print runs and large public library allocations make fine first editions tricky to find.
Bismarck Herrings is, in our experience, the most common title and book collectors should hold out for a nice copy, you may need to be less picky with other titles though.
Sadly, holding out for bargains is a fool's errand, you will need to pay if you want collectable copies of these books.
I don't believe these books were published in America under the Malcolm Torrie name.