Mandie, Celia, and Jonathan should have known that when Uncle Ned said there was a big mystery waiting for them in Holland that he meant a BIG mystery. Adventures had followed them at every stop on their summer travel through Europe with Mrs. Taft, Senator Morton and Uncle Ned, and Holland promised to be no exception. But what mystery could the quiet, peaceful land of the windmills possibly bring?
They won’t be there lo9ng before they find out. Who’s behind the mysterious resetting of the windmills blades and what message are they sending? Is it a harmless prank of or is some one really up to something bad? Are lives in danger? ( )

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