Jaci Burton's demon hunter series is very enjoyable with each book written in such a way that it can be read on its own without knowledge of the previous ones. 'The Darkest Touch', which follows on from 'Surviving Demon Island' and 'Hunting the Demon', follows twin sisters Angelique and Isabelle as they find themselves immersed in a whole new world, that of demons and the fight against them. Angelique and Isabelle first appeared in 'Hunting the Demon', they are archaeologists and the initial meeting between Angelique and the male love interest of this book, Ryder, took place in that book. However in this book we follow Ryder as he searches for the missing Angelique who has stolen the Black Diamond, a special artefact that the demons want. When Ryder finds Angelique he discovers the demons have also found her - can he keep her safe and, more importantly, can she come to terms with some insights into her history and with the possible evil nature of her twin. Alongside the primary romance we also have a romance between Isabelle and another of the demon hunters which isn't resolved in this book - it's presumably the focus of a future story.
Jaci Burton's writing style is good with her pacing well measured and a certain amount of characterisation. This British reviewer found the dialogue between the lovers rather too sappy to stomach but overall it was an interesting story with plenty of action.