The Book of Renfield
The Book of Renfield: A Gospel of Dracula is a 2005 novel written by Tim Lucas and the first of the mash-up horror-themed novels that rose to commercial prominence later in the decade. It is an unofficial prequel to Bram Stoker's Dracula. Like the original novel, Renfield is an epistolary novel written in series of written documents. It focuses mainly on Renfield, mostly remembered for his minor role in Dracula as a lunatic that ate flies, rodents and other animals, and Dr. John Seward, the administrator of an insane asylum who is trying to understand Renfield's psychosis. Plot summary
The Book of Renfield works mainly as a companion piece to Stoker's original novel. In some cases, excerpts from the actual book are used but are modified and expanded under the pretense that Dracula is nonfiction and that Seward's entries were "edited, and in some instances, rewritten by John L. Seward before he provided them for the use of Mr. Bram Stoker, at the request of Mr. and Mrs. Jonathan Harker". As such, whenever the text from Dracula is used, it is bolded to differentiate the changes. The book starts with a man discovered outside the ruins of Carfax Abbey, feasting on a rat, whose only form of identification is a handkerchief that reads "R. M. Renfield". He is taken in to Seward's asylum, where his sessions with the doctor reveal fragments of his tragic past and how he came to be Count Dracula's pawn. References 

2005 American novels
2005 fantasy novels
Epistolary novels
Dracula novels
American gothic novels
American vampire novels
Touchstone Books books