Double Crossing is a Hardy Boys and Nancy Drew Supermystery crossover novel. It was published in 1988 under the Carolyn Keene pseudonym.
The Last Resort is a Hardy Boys and Nancy Drew Supermystery crossover novel published in 1989.
At All Costs is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1997.
Exhibition of Evil is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1997.
Out of Control is a Nancy Drew and the Hardy Boys Supermystery crossover novel written by Carolyn Keene. It was published in 1997.
Nightmare in New Orleans is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1997.
High Stakes is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1996.
Murder on the Fourth of July is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1996.
Secrets of the Nile is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1995.
Danger Down Under is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1995.
Hollywood Horror is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1994.
Passport to Danger is a Nancy Drew and Hardy Boys Supermystery crossover novel. It is the 19th book in the series and was first published in July 1994 by Archway Paperbacks.
Hits and Misses is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1993.
Courting Disaster is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1993.
Tropic of Fear is a Nancy Drew and Hardy Boys Supermystery crossover novel, issued under the Carolyn Keene pseudonym. It was published in 1992.
Tour of Danger is a Nancy Drew and Hardy Boys Supermystery novel. It was published in 1992.
New Year's Evil is a Nancy Drew and Hardy Boys Supermystery crossover novel. It was published in 1991.
Best of Enemies is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1991.
Mystery Train is a Nancy Drew and Hardy Boys Supermystery crossover novel. It was published in 1990.
Buried in Time is a Nancy Drew and Hardy Boys Supermystery crossover novel published in 1990.
