First of all, let me recommend you read Mo Hayder's previous novel `Ritual' before tackling this one. It's not essential but you may find some of the plot references in `Skin' very confusing if you don't.
The events in `Skin' take place literally a few days after `Ritual'. There are three main plot strands: i) Someone appears to be killing women and disguising their deaths as suicide. He's also fond of skinning animals and obsessed by skin in general; ii) the identity of the woman run over and killed in `Ritual' by Thom, brother of police diver Phoebe `Flea' Marley is revealed. There's a major investigation into her disappearance and `Flea' is faced with a dilemma; iii) DI Jack Caffery is still searching for his `Tokoloshe Man', again from `Ritual', and the practices of `muti' or African black magic re-surface.
As you will have noticed two of the above plotlines are direct continuations from the previous book, so you'll appreciate now why I suggest you read it first! Of the three strands, by far the most unsatisfactory is the first, which I found to be totally unconvincing. Luckily, Mo handles the other two with much more skill.
Both DI Jack Caffery and `Flea' Marley are well drawn, complex characters with dark shadows in their past, which frequently occlude their waking hours. This is perhaps why there's an affinity between them.
Two or three of the diving scenes in the book in particular are almost unbearably tense and you find yourself holding your breath as you read them. There are unresolved issues at the book's close and, without giving anything away, these are clearly going to be explored further in the next book.
`Skin' is tense, brooding, dark and ambitious... but, for me, ultimately not 100% satisfying: I feel it's less than the sum of its parts and doesn't quite gel as a whole. However, there is still much to enjoy and some readers will, I'm sure, think it's tremendous. Others may hate it - it's THAT kind of book!
With her first two novels `Birdman' and `The Treatment', Mo proved she could deliver the goods big time, so I'll be sticking with her for a couple more reads at least.
p.s: `Ritual' was described as the first book in `The Walking Man' series. In that book, The Walking Man himself only appeared in a few pages and was entirely peripheral to the plot. He appears again in `Skin' - twice - but again, for a few pages only. But this book is NOT described as the second volume in `The Walking Man' series. Confused? I am!