Holly Wakefield, a criminal psychologist specialising in serial killers, encounters a dramatic change in her life when she is called upon to assist after two bodies are discovered. Working alongside DI Bishop, she is horrified to find that it is not the first time that she has seen these injuries – there is a serial killer at work. More used to dealing with incarcerated murderers, she finds herself involved with an active investigation and a killer who shares a connection with her past. A past that, for the first time, she must face head-on…

Holly’s occupation gives her an ideal background to assist with the case, and her insights soon help to unravel details that may, possibly, have been missed. It is safe to say that she has a slight obsession with killers and one particular scene where she ‘introduces’ Bishop to her own version of Scotland Yard’s Crime Museum was a very entertaining interlude in an otherwise thrilling plot. I enjoyed how Holly referenced real-life murder cases to support her theories as this added an air of authenticity to the plot.

We can tell from quite early on that Holly has a past that she would rather keep hidden, but like most secrets, they don’t stay hidden for ever. I liked how the professional relationship between Holly and Bishop developed to the point where there was a lot of mutual trust and secrets started to be shared. There is a lot of potential in this pairing and I look forward to seeing how this relationship develops in future books.

There are some particularly gruesome killings in When Darkness Calls and some equally detailed postmortems. This all culminates in a fast-paced final few chapters with some genuine heart in the mouth moments. There are numerous twists and turns along the way, meaning that when the killer is revealed it is a genuine surprise.

When Darkness Calls is a fantastic debut and looks like being a superb new series. I look forward to reading the next one.

With thanks to Little, Brown Book Group UK and Net Galley.