Further books nominally in the Miss Seeton series were then written under two other pseudonyms. Roy Peter Martin as "Hampton Charles" wrote three novels which were all released in 1990. Sarah J. Mason, writing under the name of Hamilton Crane, then took up the series writing 14 books in all, some of which are still in print. Mason's books modify Carvic's characters so much that only the names will be recognisable to readers of the first five books.