Mark Pryor is the author of the recently released The Blood Promise: A Hugo Marston Novel, along with the first and second books starring Hugo, The Bookseller and The Crypt Thief. An assistant district attorney with the Travis County District Attorney’s Office, in Austin, Texas, he is the creator of the true-crime blog DAConfidential and the author of the true-crime book As She Lay Sleeping. He has appeared on CBS News’s 48 Hours and Discovery Channel’s Discovery ID: Cold Blood.