Nancy's mysterious letter /
Carolyn Keene.
- New York : Grosset & Dunlap, c1968.
- 174 p. : ill. ; 20 cm.
- Nancy Drew mystery stories [8] .
Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.