Answer: nancydrew

AnswerCrossword Clue
NANCYDREW

"The Secret of the Old Clock" sleuth

NANCYDREW

"The Clue in the Crossword Cipher" solver

NANCYDREW

"The Bungalow Mystery" solver

NANCYDREW
Character who first appeared in "The Secret of the Old Clock"
NANCYDREW
Amateur detective in 1967's "The Clue in the Crossword Cipher"
NANCYDREW"The Hidden Staircase" sleuth