It's more of a thriller to me. The main theme music is very good but not especially suspenseful. And whatever happened to nightgown-glad women running in slow motion on a green lawn in movies, like Anne does? In the 60s and 70s, Anne Heywood was often cast as a sexually driven, neurotic and disturbed woman. She was very good at these characters and this might be the best example of that kind of role. She didn't back away from displaying her body which is in great shape in this movie.