Set in the UK in Edinburgh, Detective Inspector Luc Callanach who was a former Interpol Officer, has joined the Crime team in Scotland, he brings with him a wealth of knowledge, and also a bag full of rumours that still follow him, and his methods around.

Ava is his work colleague, and they actually make a great pair, they seems to balance themselves out, while Ava is fun loving and knowledge based, Callanach comes across as a grumpy old man with a stick up his ass!

We also get the POV of the murderer, and we are privy to the information in his mind, we can what he is doing, to whom, and who will be next, and let me tell you, It. Is. Dark!!

The gruesome parts are very descriptive, I for one loved them, but be prepared to wince a lot while reading them.

This was a very clever thriller to keep you on the edge of your seat and keep you turning the pages (or in my case listening to the audiobook) I stayed up way too late trying to piece things together and work out what was going on.