Barbie and her friend Teresa are headed to a dude ranch for Barbie's most exciting assignment yet. She's going behind-the-scenes of a new movie, Riding on the Wind, for an exclusive interview with the star, heartthrob Matt Carson. But wherever Barbie goes, a mystery is sure to follow. No sooner does she arrive at the set than the movie's other star, the champion racehorse Orion, disappears without a trace. Has Orion been stolen? It seems like everyone had a motive for wanting the horse out of the picture. Can Barbie find the real culprit behind the crime in time to save the movie?