These teenage exorcists have a target in their sights as they arrive in London to battle demons -- Harry Potter.
Brynne Larson, 18, Tess Sherkenback, 18, and her sister Savannah, 21, have been performing exorcisms since high school under the leadership of Brynne's father Rev. Bob Larson, who claims to have performed over 15,000 exorcisms.
BBC3's clip of the upcoming documentary "Teen Exorcists," shows the poised and photogenic trio earnestly talking to filmmaker Dan Murdoch about why they consider London a "center of witchcraft." The Arizona girls headed to London as part of their first international tour with Rev. Larson, and they believe that J.K. Rowling's beloved Harry Potter series is responsible for an upsurge of occult activity in the U.K.
Savannah seriously weighed in on why London is full of dark forces, explaining, "I think it's been centuries in the making, but I believe it all kind of came to a pinnacle, a peak, with the Harry Potter books that have come out, and the Harry Potter rage that swept across England."
Her sister Tess agreed, commenting, "The spells and things that you're reading in the Harry Potter books? Those aren't just something that are made up-- those are actual spells. Those are things that came from witchcraft books."
"Harry is using this magic for good. So here we have the dangerous idea that you can use this magic for good or bad. Whereas in reality, all magic is bad, because you're getting your power from Satan," said Brynne.
The girls have vowed never to read the Harry Potter novels, and hope to help U.K. teenagers defend themselves from "inviting Satan to possess them by reciting the spells in the Harry Potter books."
