This is Tony Strong's best thriller so far. It has the same elements as some of the earlier books - a damaged but likeable female heroine, an unusual sexual predator, and plenty of twists - but it's also a great romance, with a well-drawn relationship between a burnt-out policeman and the heroine, whose rape he's investigating. The twist is that they're not meant to have a relationship at all, because it could jepoardise the CPS case in court if the defence alleged that he'd influenced her evidence - which, of course, is exactly what happens, but the reader is unsure whether this is a good thing or a bad thing. It's a lower body count than some of the earlier books, but it's also the most believable and the most thought-provoking. Oh yes, and there's the usual touches of moral ambiguity and sexual darkness that this author likes to inject into all his stories. The emotions of the policeman in particular, wrestling with his professional conscience (because he knows he shouldn't sleep with a witness) and his personal guilt (because he knows that Ros has been raped and is therefore emotionally damaged) are very well done. If you like Nicci French's Killing Me Softly or the earlier books of Minette Walters, you'll like this a lot.