The Invisible Intruder

The Invisible Intruder

Author	Carolyn Keene
Country	United States
Language	English
Series	Nancy Drew Mystery Stories
Genre	Juvenile literature
Publisher	Grosset & Dunlap
Publication date	1969
Media type	Print (Hardback & Paperback)
ISBN	0-448-09546-7
OCLC	39934643
Preceded by	The Spider Sapphire Mystery
Followed by	The 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

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.

Helen, Nancy's friend from the earliest books in the series, makes a rare appearance.

Nancy Drew

The series and novels

Nancy Drew Mystery Stories

1930s	The Secret of the Old Clock (1930) The Hidden Staircase (1930) The Bungalow Mystery (1930) The Mystery at Lilac Inn (1931) The Secret at Shadow Ranch (1931) The Secret of Red Gate Farm (1931) The Clue in the Diary (1932) Nancy's Mysterious Letter (1932) The Sign of the Twisted Candles (1933) The Password to Larkspur Lane (1933) The Clue of the Broken Locket (1934) The Message in the Hollow Oak (1935) The Mystery of the Ivory Charm (1936) The Whispering Statue (1937) The Haunted Bridge (1937) The Clue of the Tapping Heels (1939)
1940s	The Mystery of the Brass-Bound Trunk (1940) The Mystery at the Moss-Covered Mansion (1941) The Quest of the Missing Map (1942) The Clue in the Jewel Box (1943) The Secret in the Old Attic (1944) The Clue in the Crumbling Wall (1945) The Mystery of the Tolling Bell (1946) The Clue in the Old Album (1947) The Ghost of Blackwood Hall (1948) The Clue of the Leaning Chimney (1949)
1950s	The Secret of the Wooden Lady (1950) The Clue of the Black Keys (1951) The Mystery at the Ski Jump (1952) The Clue of the Velvet Mask (1953) The Ringmaster's Secret (1953) The Scarlet Slipper Mystery (1954) The Witch Tree Symbol (1955) The Hidden Window Mystery (1956) The Haunted Showboat (1957) The Secret of the Golden Pavilion (1959)
1960s	The Clue in the Old Stagecoach (1960) The Mystery of the Fire Dragon (1961) The Clue of the Dancing Puppet (1962) The Moonstone Castle Mystery (1963) The Clue of the Whistling Bagpipes (1964) The Phantom of Pine Hill (1965) The Mystery of the 99 Steps (1966) The Clue in the Crossword Cipher (1967) The Spider Sapphire Mystery (1968) The Invisible Intruder (1969)
1970s	The Mysterious Mannequin (1970) The Crooked Banister (1971) The Secret of Mirror Bay (1972) The Double Jinx Mystery (1973) Mystery of the Glowing Eye (1974) The Secret of the Forgotten City (1975) The Sky Phantom (1976) The Strange Message in the Parchment (1977) Mystery of Crocodile Island (1978) The Thirteenth Pearl (1979) The Triple Hoax (1979)
1980s	The Flying Saucer Mystery (1980) The Secret in the Old Lace (1980) The Greek Symbol Mystery (1980) The Swami's Ring (1981) The Kachina Doll Mystery (1981) The Twin Dilemma (1981) Captive Witness (1981) Race Against Time (1982) The Broken Anchor (1983) The Mardi Gras Mystery (1988) The Case of the Rising Stars (1988)
1990s	The Mystery of the Masked Rider (1992) The Treasure in the Royal Tower (1995) The Wedding Day Mystery (1997) The E-mail Mystery (1998)
2000s	Whispers In the Fog (2000) The Legend of the Emerald Lady (2000) Mystery By Moonlight (2002) The Bike Tour Mystery (2002) The Mistletoe Mystery (2002) No Strings Attached (2003) The Riding Club Crime (2003) Danger on the Great Lakes (2003) Werewolf in a Winter Wonderland (2003)