<P> The Adventures of Mary - Kate & Ashley is a series of musical mystery videos starring twin actresses Mary - Kate and Ashley Olsen . The series was also written as children's books, showing the twins on the cover . The video series was distributed by KidVision . </P> <P> Each video begins with the girls singing the theme song . Following the theme song, the girls receive a phone call, informing them of some urgent mystery that needs to be solved . Their motto is "Will solve any crime by dinnertime ." Each video features the girls singing multiple songs about the mystery they are working on . They never fail to solve the mystery with their sidekick, Clue (a Basset Hound), and, indeed, the solution is usually something either very obvious or very trivial, to give the video a humorous ending . A set of books was written as a companion piece to the show . </P> <P> Each episode is named "The Adventures of Mary - Kate & Ashley" followed by the name of the mystery . </P> <Dl> <Dt> 1 . The Case of Thorn Mansion (1994) </Dt> <Dd> A ghost is supposedly haunting a mansion in Transylvania, and the girls must figure out who or what is actually behind it . The "ghost" ends up being the caretaker of the mansion who is also a beekeeper . </Dd> </Dl>

Where was the case of thorn mansion filmed