Grady Hendrix is keeping busy in genre writing, but you might find him a little hard to pin down. After getting his start in film journalism, Hendrix has kept busy with books like 'My Best Friend's Exorcism' and 'Horrorstör', his horror publishing history 'Paperbacks from Hell', and screenwriting gigs on Mohawk and now, RLJE Film's Fangoria co-production, Satanic Panic. With Chelsea Stardust (All That We Destroy) in the director's chair, Satanic Panic stars Hayley Griffith as a pizza girl desperate for a big payday, who takes a delivery to a far-off wealthy neighborhood in …