Joseph Delaney used to be an English teacher, before becoming the best-selling author of the Spook's series, which has been published in 30 countries and sold over 4.5 million copies worldwide. The first book, The Spook's Apprentice, was adapted into a major motion picture starring Jeff Bridges and Julianne Moore.

"'An evocative, spine-tingling sequel to the Spook's Apprentice.'" -- Amanda Craig The Times "'Tom Ward is back in another eerie, spine-tingling adventure...you'll love getting lost in this spooky tale.'" Funday Times "Really impressed by [this] ...genuinely creepy ... very pacy ...the characters were very believable." -- Damian Kelleher Radio 4 Front Row "'Full of scary moments which will get the hearts of even the most fearless readers pounding, while keeping them glued to the action.'" Lancashire Evening Post "'Readers who were spellbound by the goings-on in 'The Spook's Apprentice' will be equally engrossed by this sequel.'" Waterstone's Quarterly