Rookie Chicago crime-fiction writer Sean Chercover is having the best “Killer Week” ever. On Thursday, both newly published authors will be promoting their newest contribution to the printed page of murder, madness and mayhem at the Book Cellar. The book, titled “Killer Year: Stories to Die For,” is a collaborative anthology put together by thirteen writers—all of whom unleashed their first novels just last year. Chercover worked as a private investigator in Chicago for four and a half years, an experience that spawned his story included in the book, “One Serving of Bad Luck.” “It’s not like on TV—you find the information you need to serve your client and the bad guys don’t always come to justice,” Chercover says about his days as a gumshoe. Today, he enjoys the artistic freedom in fiction writing to explore, corrupt and create his characters. “You do spend a lot of time in the heads of the characters you created and you are exploring the darker traits of human beings,” he says. “You go to the dark place, but you do come out the other side.”