''The Invisible Intruder'' is the 46th volume in the

Nancy Drew Mystery Stories The ''Nancy Drew Mystery Stories'' is the long-running "main" series of the ''Nancy Drew'' franchise, which was published under the pseudonym Carolyn Keene. There are 175 novels — plus 34 revised stories — that were published between 1930 and ...

series. It was first published in 1969 under Carolyn Keene. The actual author was ghostwriter

Harriet Stratemeyer Adams Harriet Stratemeyer Adams (December 12, 1892 – March 27, 1982) was an American juvenile book packager, children's novelist, and publisher who was responsible for some 200 books over her literary career. She wrote the plot outlines for many boo ...

Plot summary

Nancy and her friends are invited on a ghost-hunting tour, visiting various locations reputed to be haunted. They gather clues that point to a more mundane explanation. Nancy uncovers a gang of thieves that are stealing rare shells from collectors. Some of these shells are no longer rare, such as Conus gloriamaris. Helen, Nancy's friend from the earliest books in the series, makes a rare appearance. Previously Helen Corning, she is now married to Jim Archer and goes by Helen Archer.The Invisible Intruder, p. 1, 6-

References

External links

* Nancy Drew books 1969 American novels 1969 children's books Grosset & Dunlap books Children's books set in the United States {{1960s-ya-novel-stub