I'm sorry I was not able to read and review this book before it was archived due to serious health issues.

Having raced through Devil’s Bargain, the first book in Rachel Caine’s Red Letter Days series (or more properly duology), I was eager to read Devil’s Due.

Devil’s Bargain introduced Jazz Callender, and Lucía Garcia, once strangers, whose new private detective agency was funded by an anonymous organisation, with a few strings attached. By the end of the novel, Jazz and Lucia had identified The Cross Society as their mysterious benefactor and learnt of its counterpoint, the Eidolon Corporation. Unraveling the motives of both organisations reveals a dangerous game is being played, and Jazz and Lucia are trapped in the middle of it all.

While Jazz is the focus of Devil’s Bargain, Lucia takes the lead in Devil’s Due. Caine barely gives Lucia time to breathe as she is confronted by a series of crisis, including being exposed to Anthrax, stalked by a corrupt cop, abducted, and shot. I like Lucia, she is the calmer and more calculating member of the partnership, drawing on her extensive experience as an operative with a number of shadow organisations, but her vulnerabilities are also explored when she loses a friend, and falls in love with Ben McCarthy.

Devil’s Due is a frantic thrill ride, with several shocking twists, as Lucia and Jazz race to free themselves, their friends, and the world, from the interventions of The Cross Society and Eidolon Corporation. I was very happy that the story arc was satisfyingly finalised offering an appropriately explosive ending to the duology.

The Red Letter Days is an entertaining duology, and I enjoyed it’s fast paced combination of mystery, thriller, paranormal and romance.