This article explores the construction of female adolescence in the first three texts of the Nancy Drew Mystery series: The Secret of the Old Clock (1930), The Hidden Staircase (1930), and The Bungalow Mystery (1930). It reviews, briefly, the development of the concept of adolescence and its gendered implications, particularly the association of female adolescent sexuality with delinquency. I argue that the Nancy Drew series rejects the construction of adolescence as a period of turmoil and emotional instability, as well as the prescription of constant adult supervision. The character of Nancy Drew also captures the contradictory messages of female adolescence in the 1930s when girls were represented as sexually attractive and aggressive but were denied sexual desire.