When Sergeant Anna Cameron arrives at Glasgow's Stewart Street police station to take charge of the Flexi Unit she shows a very confident front - composed, successful, and more than a little frosty. Her personal life, however, is anything but composed and successful. Prostitutes are being viciously attacked and Anna's team is tasked with solving the crimes - a task made much more difficult by the often suspicious and sometimes downright unhelpful nature of the victims. In addition, Anna gets involved in the case of an elderly Polish man who is the target of racial abuse. Anna is a really interesting character - sometimes frustrating, sometimes cold, often very likeable, but above all, never dull. All the characters are very well drawn and some of them are surprisingly touching, without being cloying and melodramatic. In places the book is very dark and not for the squeamish. Along with the darkness there are also some great touches of black humour which mean that it's not a depressing read. The setting is one of the best depictions of Glasgow I've read, and it's shown as the schizophrenic, gritty, in-your-face, characterful city it is. On top of all that, there's a gripping plot that is full of twists and turns. But this is not a bog standard police procedural. It's an insight into real peoples' lives - police, victims and criminals - who all come across in shades of grey.