Ok heres the plot can someone supply a name for my im going batty

Tourists on a bus are stranded outside a castle
they go in and are met by a woman cant remember if she is a demon vampire whatever anyway they all die one by one until only the priest is left. she offers to bring them all back to life in exchange for his soul if they will go away. so he agrees and they drive off only to fall off a cliff

I seem to remember it starting out with the girl as a baby getting sacrificed

saw this in late 70s i believe at a drive in with my parents and more recently on television i caught the tail end. there was a guillotine scene and a goldfish in a glass of champagne anyway can't find it on imdb can anyone here help me out.