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A Question of Guilt is a 1996 Hardy Boys and Nancy Drew Supermystery crossover novel.
Double Crossing is a Hardy Boys and Nancy Drew Supermystery crossover novel. It was published in 1988 under the Carolyn Keene pseudonym.
Process of Elimination is a 1998 young adult mystery novel by Carolyn Keene. It is the final novel of the Nancy Drew and Hardy Boys Supermystery crossover series.
Operation Titanic is a Nancy Drew and Hardy Boys Supermystery crossover novel. It was published in 1998.
Royal Revenge is a Nancy Drew and Hardy Boys Supermystery crossover novel, published in 1997.
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.
Evil in Amsterdam is the 17th book in the Nancy Drew and Hardy Boys Supermystery series by Carolyn Keene and was published by Archway Books in November 1993.
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.
High Survival is a Nancy Drew and Hardy Boys Supermystery crossover novel, 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.
