If you like Nancy Drew mysteries

Hopefully you will enjoy some these titles, all of which feature a smart female sleuth!

The Case of the Missing Marquess by Nancy Springer.
Enola, the niece of Sherlock Holmes, is drawn into two mysteries, both surrounding missing persons.

Chasing Vermeer by Blue Balliett.
When seemingly unrelated and strange events start to happen and a
precious Vermeer painting disappears, Petra and Calder combine their
talents to solve an international art scandal.

Down the Rabbit Hole by Peter Abrahams.
Ingrid's decision to run to soccer practice, rather than wait for a
ride, begins a succession of events that draws her close to a killer.
This is the first in the Echo Falls Mystery series.

The Sammy Keyes series by Wendelin Van Draanen.
The most recent installment is called Sammy Keyes and the Dead Giveaway. In this book, Sammy worries about school dances and other teen problems while she investigates the shady dealings of some local politicians and developers.