I found this easily the most enjoyable and riveting book in the Nicci French series and it is the fourth book featuring the psychotherapist Frieda Klein. They have appeared annually so I am already looking forward to the fifth book which should feature the word 'Friday' in its title and appear in 2015 if the current pattern is continued. The strengths of this book are the descriptions of the characters and the locations. As there is a recurring cast of characters the reader knows them all quite well as they all return with varying amounts of appearance. Sandy,presumably deliberately, is not particularly fleshed out and does not engage in the same way as characters such as Chloe, Sasha and Josef. However, the character of Dean is beginning to become more than irritating, it is actually becoming intrusive and completely unrealistic, even in a work of fiction such as this. After 23 years Frieda returns to Braxton, the sleepy Suffolk coastal town where she spent her first 16 years. The story grips and develops at a pace that is neither rushed or laboured. The denouement is slightly disappointing as it involves something other than police procedure or intuitive deduction by Frieda but the involvement of a character that is threatening the very fibre of such a strong series. The married couple that are Nicci French have created a series that is immeasurably superior to the countless plethora of detective, serial killer, mass murderer, style books that cover the shelves in every bookshop and library. Everything (apart from Dean) is just right - the underground rivers of London and their connections to the Thames, the haunting and realistic depiction of London - often on a windswept or rain-pelted night , even the end-papers with sketch maps of London featuring relevant underground rivers in the style of a casual artist such as Klein herself. Thank you so much Nicci French for another gripping tale - but please don't drag the Dean thread much longer as it is beginning to dominate the stories in an insidious fashion and I'm not sure that this is what you intend and I don't believe it is what the reader enjoys either.