In the Archive of Sinners book 1 we meet Cain Investigations, Thomas and Vere who have been asked to look into a case dealing with men going into a coma for weeks on end, through out there investigation Thomas falls into a coma while Vere along with their new ally and Vere's new paranormal teacher Priti who is a succubus track down the person or being responsible for the comas. I'll leave it at that but I am looking forward to reading the rest of the series and I highly recommend that you pick up a copy too.