Jack and Annie Blizzard by the blue moon

Jack and Annie go to New York and their mission is to find a unicorn and a little girl must love him. So they had a book of spells and spell they had left was to turn other people into ducks. So somebody else was trying to the unicorn. So the other people got the unicorn but Jack and Annie got him back by using their only spell: turning people in to ducks. The people who were trying to get the unicorn turned into ducks for a little while.