Product Description: The boys are back in a 50th Anniversary Edition, with a new introduction by Sheridan Brinley. A strange sea monster appears on the lake...a fortune is unearthed from an old cannon ...a valuable dinosaur egg is stolen. Watch out as the Mad Scientists turn Mammoth Falls upside down! Take seven, lively, "normal" boys -- one an inventive genius -- give them a clubhouse for cooking up ideas, an electronics lab above the town hardware store, and a good supply of Army surplus equipment, and you, dear reader, have a boyhood dream come true and a situation that bears watching...read more

Seven boys organize the Mad Scientists' Club to investigate a mysterious object dropped by an Air Force bomber into Strawberry Lake.

The Mad Scientists of Mammoth Falls embark on an international adventure involving jewel thieves, a long lost diamond, a zany professor, and his two students

Despite her father's objections, a young Amish girl secretly looks forward to attending public school where she makes a best friend and gains a new perspective on her family's way of life.

Sauncey, a young African American girl, helps her mother in the Washington City house of Mr. Charles King, who has been commissioned to paint the portraits of chiefs from different Indian nations.

Recounts how Mrs. Pickergill of Baltimore was commissioned to make the huge flag which flew at Fort McHenry over Baltimore Harbor during a battle with the British in 1814.

Despite her father's objections, a young Amish girl secretly looks forward to attending public school where she makes a best friend and gains a new perspective on her family's way of life

When a mysterious animal suddenly floats into town from a distant place, Miss Pickerell and her nephew Euphus attempt to preserve the creature and recreate its environment until they can return it to its home

When prices at her supermarket mysteriously skyrocket, Miss Pickerell discovers a culprit who's been tampering with the supermarket's computer program

While traveling on the Space Shuttle, Miss Pickerell discovers that it is hauling a spy satellite programmed to spread nuclear reactor fragments.

Square Toe Mountain is crumbling, the frogs have stopped peeping, Miss Pickerell's cow is crying, the crops are dying, the Governor's wife is sick, and Miss Pickerell has a clue