If you enjoy thrillers, this is a good one. For me, it was all I could do to get through to the end; it was harrowing. Harrowing is not my favourite thing, but there was something intriguing about the story that made me “go with it”. I really liked the main character, Dr Theo Cray, a Computational Biologist, and I loved his scientific method of solving the puzzle, however it’s much too “thrilling” for me so I won’t go for book two in the series. If you enjoy a thriller you’ll very likely enjoy this story.