I have given this book 5 stars, not so much for the plot itself, but the way in which Rendell explores the nature of personal fantasy. The main character, Mix Cincelli, is initially portrayed as perhaps a fairly harmless character, albeit obsessive about the serial murderer, Reginald Christie. It is not long before Rendell gives the reader access to those disturbing psychopathological thought processes that become increasingly obsessive, and equally dangerous, as would befit someone with a probable diagnosis of borderline personality disorder.
However, after reading this book, it was with the minor characters that had the most effect upon me. I was left with that disturbing sense that the gap between sanity and some degree of madness, is not as great as we would perhaps like it to be for comfort. We all inhabit the same world, but our mutual experiences and how we perceive them individually are indeed wholly unique. Nerissa, for example has spent years nurturing a love for her neighbour Darel, yet has her fantasy collapsing within seconds once she is forced to face the reality of this artificial relationship.
How much time is wasted in our lives believing what we want to believe? No more is this highlighted when we experience the tragedy of Gwendolen, who, as with Miss Haversham in David Copperfield, wastes her life in the hope that the man she has fantasised about, will indeed, whisk her away like a knight in shining armour. No such ending for Gwendoline, but a sad and poignant ending that left me feeling how important it is to grab the realities of opportunity in the "here-and-now", and not dwell on the fantasies or wish-fulfillments that will probably never be.
Ruth Rendell has indeed excelled herself again in this book.