WHAT YOU CAN BELIEVE ABOUT DRUGS High School Help Line

By Daniel Cohen

Are You Ready the Best and Worst Predictions of the New Millenium

By Dan Cohen, Daniel Cohen

Undefeated

By Dan Cohen

The case of the long-lost twin

By Dan Cohen

When Miss Tromly dies, a woman posing as her twin sister threatens to cheat Miss Tromly's housekeeper out of her inheritance.

The case of the missing poodle

By Dan Cohen

A poodle disappears from a dog show and sisters Ruthann and Polly help Officer Greenwood find the dognapper.

The mystery of the faded footprint

By Dan Cohen

Two sisters assist their police officer friend in following clues to find who stole a wallet.

The mystery of the marked money

By Dan Cohen

Two young girls help solve a case of fraud involving marked bills.

The case of the battling ball clubs

By Dan Cohen

Before a big game between two rival baseball teams, the manager of one is accused of stealing an autographed picture of Babe Ruth, owned by the other manager.

The case of the Spanish stamps

By Dan Cohen

While visiting Mexico City with their parents, Ruthann and Polly solve the mystery of two missing Spanish stamps that Ruthann had wanted to buy for her collection.

The mystery of the Mellafeller elephant

By Dan Cohen

When a valuable piece of art disappears from a museum, Ruthann and her sister Polly help Officer Greenwood solve the mystery.