After capsizing her rowboat on Twin Lakes, Nancy sets out to help the girl who saved her life investigate the mysterious events surrounding a deserted bungalow.

Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

An anonymous diary is a mystery with handwriting that is difficult to decipher. It is filled with technical drawings and chemical formulas. Was the destructive explosion an accident or an act of revenge?

Teenage detective Nancy Drew uses her courage and powers of deduction to solve the mysterious happenings in an old stone mansion.

A carrier pigeon furnishes Nancy with a clue to a mysterious retreat.

Nancy's friend Maggie gets a star role in the dance Sleeping beauty. Someone is intent on ending Maggie's career. Will Nancy be able to solve the case?

Nancy goes undercover at the exclusive Green Club when George's cousin, a candidate for city council, is targeted by a mysterious saboteur who threatens the plans to build a new sports complex.

Nancy, Bess, and George are on an Alaskan cruise when things start to go awry.

Nancy's classmate, Willa, needs her help. Willa is convinced something is terribly wrong with her friend Izzy, but everyone has dismissed Willa's concerns, saying it's just teen angst. But Willa thinks it's more than that; she thinks Izzy is possessed.

When Nancy's friend Deirdre predicts the future by reading hot cocoa marshmallows and many of the visions come true, Nancy and the gang wonder what it is going on and get even more suspicious when their snowman disappears.