To battle a menacing evil figure, a group of children team up with amazing mechanical machines built by genius clockmaker Karl Indergarten.
Best friends Karlheinz Indergarten and Leopold Croak clash in an epic, imaginary battle waged in the branches of an enormous, ancient oak tree.
But when lightning strikes young Leopold, he loses his imagination, and with it, his sense of right and wrong.
The damaged boy grows to adulthood, treading a sinister path of industrial conquest.
And Leop.
