The Invisible Intruder

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The Invisible Intruder
AuthorCarolyn Keene
CountryUnited States
SeriesNancy Drew Mystery Stories
GenreJuvenile literature
PublisherGrosset & Dunlap
Publication date
Media typePrint (Hardback & Paperback)
LC ClassLCCN 69-12166
Preceded byThe Spider Sapphire Mystery
Followed byThe Mysterious Mannequin

The Invisible Intruder is the 46th volume in the Nancy Drew Mystery Stories series. It was first published in 1969 under Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams.

Plot summary[edit]

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.[1]

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.[2]


  1. ^ Keene, Carolyn (1994) [1969]. The Invisible Intruder. New York: Grosset & Dunlap. p. 159. ISBN 0448095467.
  2. ^ The Invisible Intruder, p. 1, 6-