A bump in the road sends Miss Mallard crashing through bushes and into the middle of a field in Holland. Separated from the bicycle tour she and Willard are on, Miss Mallard soon finds herself involved in a smuggling ring mystery. While Willard searches for his aunty, Miss Mallard discovers a code book of clues that lead her to save all of Holland from being flooded.

Miss Mallard is an avid gardener so she's delighted when the famous botanist Dr. Yang Ho Long Duck invites her to be his special guest at the Seoul Flower Festival. Willard is less than pleased because of his allergies, which turn out to be a blessing when Dr. Yang Ho Long Duck's newest orchid is stolen. Willard's allergies help solve a very pungent mystery, one that will allow the villain to take over the entire world thanks to the smell of just one orchid.