On an icy morning, a mother wakes to find her daughter's blood-soaked body frozen to the road. Who would carry out such a killing on the victim's doorstep?

Straight off her last harrowing case, Detective Erika Foster is feeling fragile but determined to lead the investigation. As she sets to work, she finds reports of assaults in the same quiet South London suburb where the woman was killed. One chilling detail links them to the murder victim - they were all attacked by a figure in black wearing a gas mask.

Erika is on the hunt for a killer with a terrifying calling card. The case gets more complicated when she uncovers a tangled web of secrets surrounding the death of the beautiful young woman.

Yet just as Erika begins to piece the clues together, she is forced to confront painful memories of her past. Erika must dig deep, stay focused and find the killer. Only this time, one of her own is in terrible danger...

From the global million-copy bestselling author comes a totally heart-racing, hold-your-breath read that will keep you hooked until the very last page.

Read what everyone is saying about the Detective Erika Foster series:

'Blindingly excellent ... These books should come with a disclaimer as once you start reading you aren't going to want to walk away. This is a book you are going to want to feast upon and devour as fast as you can.' Jen Med's Book Reviews

'OMG what a story ... you seriously need to read this one. I devoured this in one sitting, it is certainly one pulse-racing, nail-biting, gritty read ... I thought my heart was going to explode ... will definitely keep you on the edge of your seat from start to finish.' Chelle's Book Reviews

'I freakin' LOVED it! . . . Once in a while a book stops you in your tracks . . . this is THAT book!' Crime Book Junkie

'I loved, loved, loved this book and Erika Foster is most definitely my kind of heroine. She is smart, tenacious, direct and passionate...I found the writing tight, evocative and enthralling. I CANNOT wait for the next installment.' Angela Marsons

'OH MY GOD! Just let me a take a moment while I catch my breath! I LOVED IT! WHAT A BOOK! WHAT AN AUTHOR! WHAT A READ! It is all-consuming, there is no let up... every twist and turn is designed to make you gasp, to make your head spin and your heart beat out of your chest.' Emma the Little Bookworm

'A non-stop, edge-of-your-seat, rollercoaster of a thriller! The ending, oh the ending! My mind is still blown! This book does not disappoint!' The Book Addicted Boy