detective and mystery stories

After a girl's personality changes drastically, a boy and his monkey investigate the mystery.

McGurk is confined to an upstairs bedroom when he breaks his leg, but that doesn't stop him and the rest of his detective organization from uncovering a clever robbery scheme being plotted right next door.

After River Junction's Christmas tree loses its star, two children determine to identify the thief.

The Skate Patrol helps track down the despicable Creep Thief, who steals from old ladies.

Haunted by a recurrent nightmare, a young English girl travels to Cornwall to trace the source of the dream.

While solving the mystery of an old man's disappearing fortune, Nancy ends a family feud and reveals the identity of an orphan of unknown parentage.

Nancy and her friends George and Bess attempt to exonerate an inventor who is suspected of arson.

Nancy investigates when a birthday party at Haunted Harriet's restaurant is ruined by a cruel joke.

Nancy investigates when reporter Alice Stone's visit to Sandburg Elementary School is sabotaged.

Penny's expectations of a long boring summer are exploded when she meets an elderly, practically naked, woman in a tree and soon finds herself embroiled in a mystery involving the Beacon Manor Senior Citizen's Residence.