60th Anniversary Edition

A strange sea monster suddenly appears on the lake ...a fortune is unearthed from an old cannon ... a valuable dinosaur egg is stolen.

Who's responsible? Those seven junior geniuses - and their wild ideas

"Every time you Mad Scientists get mixed up in something, it means trouble " cries the mayor of Mammoth Falls.

Watch out as the seven junior geniuses of the Mad Scientists' Club turn the town upside down.

Fully illustrated with classic Charles Geer drawings.