You can tell this book is from the 70s! Very dated views of anybody who isn't a straight white man, and a general mean-spiritedness throughout that I didn't like. 

I did like some of the individual stories of the fog's effects, but there were a few too many - and Hebert killing off

the entire population of Bournemouth

in the middle made the book feel oddly paced. 

The last third had lots of tense moments, my favourite scene was

the man with his wife's decapitated head. Very cinematic!

A horror masterpiece.
Can you imagine losing your mind to an ecological phenomenon? Well, James Herbert did and this horror story is the result of that. When a crack in the earth releases a fog that turns anyone it touches homicidal, suicidal, or both, it is a race against time to destroy it before it consumes everyone in England. The set up of the narrative is masterfully crafted to make it a haunting tale that hangs around you. It makes you want to stop reading but also compels you to finish it.
This does contain a lot of sensitive topics, such as rape, child molestation, murder, suicide, and gore, so I would recommend checking for a list of warnings before reading if this isn't your style.