Having never read any of McDermid's fiction, only her non fiction book on Forensic science, I thought it was high time to try one. Perhaps the choice of this book, which I now realise is quite well into a series, was not the best. Although I could see accomplished writing here, I found it hard to differentiate the various police forces who were investigating the murders and to emphasise with Tony Hill, a major character. Although he is damaged, having been brought up by a terrible mother and feeling abandoned by his, now deceased, father, it seemed a bit cliche to have this trope yet again - he is a great crime profiler because he is so messed up himself? I also had no patience with his prevarication about looking into his father's life, and the legacy left to him.
It also takes a stunningly long time for the police to realise the connection between the main murder cases. Agreed that the lack of joined up systems between forces would hamper things, but given the nature of the crimes, they would have been front page news and you would expect the media at least to link them. Given that Jordan's unit is comprised of supposedly creative and lateral thinking individuals, it does make them come over as rather dense to say the least.
Some of the minor characters are well developed such as Paula, one of the task force led by DCI Carol Jordan, and Ambrose who is on another force but is drawn into the main case. However, given the main role of IT in this, a lot of the key clues - such as the villain using approach and use computers in different locations - comes across as curiously old fashioned. The author is definitely wise to invent a social media site given what ends up happening under its auspices, but even in 2009 surely there was software which could obsfucate internet addresses? The development seemed slow in places although it picks up towards the - to me, not that convincing - denoument, so not a keeper for me.