Danny Dunn And The Smallifying Machine

Plot

Are there enemy spies following Professor Bullfinch? Is he working on a secret government invention?

Danny and his friends, Joe and Irene, decide they must warn the Professor of possible danger. They track him down to an old barn, where he's hidden his workshop. Once inside all they find is a weird and fascinating machine. Danny tries out one of two levers--but he isn't prepared for what happens next! He and his friends are trapped inside the machine and shrinking fast..