A well-researched overview of horror cinema and ominous sci-fi films. Clarens starts off with a chapter on Georges Méliès (since the sets, costumes, makeup and camera tricks in his films laid down the groundwork for all fantastical/grotesque cinema) and ends with a chapter that discusses some of the more intelligent horror and sci-fi films of the 1960s (i.e., The Damned [1963], The Birds, La Jetee, Alphaville, and Fahrenheit 451 [1966]).
Throughout the book, Clarens persuasively defends horror from its naysayers, analyzes what makes the genre so enduring, provides bits of important film history, reviews numerous landmark horror and sci-fi films, and gives attention to a lot of interesting obscure films from all over the world. You'll walk away with tons of recommendations, and to make hunting down particular films as easy as possible, the book includes an extensive index and an appendix that lists off the credits of every film mentioned by Clarens.
The one criticism I have is some of Clarens's evaluations are questionable. Like many critics of the 1960s, he prudishly dismisses Hammer's Gothic horror films for their violence and sexuality. Also, he is surprisingly harsh towards Nosferatu, The Innocents, and many other classics. Nonetheless, Clarens is always mature and understandable.
If you're a huge fan of pre-1967 horror cinema and want to learn about the history of the genre and/or get some lesser-known recommendations, I highly recommend this book.