After capsizing her rowboat on Twin Lakes, Nancy Drew 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.

Nancy Drew becomes involved in a double mystery concerning a haunted bridge and jewel thieves.

Nancy and her friends establish headquarters in a seaside yacht club to investigate strange happenings in a book store and the disappearance of a marble statue.

Nancy races against time to unravel the clues in a dead man's letters. If she succeeds, Philip March and his little granddaughter can be saved from financial ruin. It takes courage and ingenuity for the alert young detective to discover the significance of the skeleton with the upraised arm and to find the source of the spooky sounds of music in the old attic.

The masquerade party at the Hendricks' mansion quickly turns into a mystery when Nancy and her favorite date, Ned Nickerson, spy a stranger about to climb the rose trellis to the second story.

An unusual hex sign leads Nancy Drew to Pennsylvania Dutch country in pursuit of a thief who stops at nothing to get rid of her.

Vacationing at the seashore, Nancy investigates a cave that is rumored to have a ghost and a tolling bell. A sudden rush of water fills the cave and Nancy and her friends barely escape with their lives.

Nancy and her friends find they have to overcome people's superstitions and fears in solving the case of a "jinxed" and threatened bird farm.

Nancy Drew and her friends go on a ghost hunting expedition and become involved with a gang of thieves who concentrate their activities on collectors of valuable shells.