The bank president has disappeared -- and so has a big sum of money Are the disappearance of the president and the disappearance of the money related? And what does the strange symbol of the plumed serpent, found on some paper, have to do with it all? Penny searches for the answers to this and more in the Whispering Walls This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

A bridge is dynamited, and Burt Ottman is accused of the crime. Penny Parker isn't convinced that he's guilty. She works with an old man, Noah, to find answers. But can she prove Burt's innocence? Find the answers to this and more in Saboteurs on the River This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

When Penny Parker and her friend Louise go to the nearby swamp, they soon find themselves embroiled in intrigue. Louise loses her dog while there, and in the process of finding the dog, they find an abundance of mysteries to be solved Following along with their adventures in Swamp Island This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

Penny Parker takes on a job at the newspaper during her school vacation. But all does not go well as she covers a story of the explosion at the Conway Steel Plant. What caused the explosion? There are plenty of mysteries to be had Follow Penny as she solves the mystery of the Signal in the Dark This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

Penny Parker goes on vacation with her father and quickly becomes engrossed in a search for foreign spies What are the spies up to, and what information are they transmitting over the radio? And, how does her father's new friend fit into the whole picture? Follow Penny as she solves the mystery of The Voice from the Cave This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

Penny Parker is hot on the trail of thieves that are hitting the airplane factory. Brass is disappearing, and all signs point to Sally Barker as the perpetrator. But is she? Or was she framed? Follow Penny as she investigates the Guilt of the Brass Thieves This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

There's a mysterious wishing well on an old abandoned estate. If you make a wish, it is granted But that's not the only strange thing going on with the property How are wishes being granted? And why is the neighbor trying so hard to buy the land? Penny searches for the answers to this and more in The Wishing Well This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

A reward is being offered to the person who captures the Headless Horseman. Penny and her friend Louise go off to Red Valley in a quest to win the reward. But will they find the Horseman? And will they survive the unexpected flood that hits? Find out in Hoofbeats on the Turnpike This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

Penny Parker sees an odd tattoo on a strange sailor. After writing a story about it, all trouble breaks loose Why? What is the real story behind the sailor and the tattoo? Find out in The Secret Pact This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.

Penny Parker and her friends discover a strange cult operating at a local monastery. What is responsible for the strange sounds coming from the monastery? And is the mystery of the missing woman connected to the cult and the monastery as well? Find these answers as Penny investigates The Cry at Midnight This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.