Nancy Clue and the Hardly Boys in a Ghost in the Closet

"Boys and girls alike will thrill over the adventures of the Hardly Boys, as the famous boy detectives join forces with Nancy Clue and Cherry Aimless, R.N. to solve the mystery of the missing Hardly parents -- who have been kidnapped while on a mission of national security! While the brave boys go underground to discover caverns filled with evil scientists and G-me, Nancy and Cherry go undercover in the twisted Dr, Fraud's River Depths Sanitarium, where Nancy discovers evidence about a missing parent of her own. More importantly will Nancy ever win back Cherry's love?"--Publisher's description.