A local author and martial artist will be visiting the Knoxville Public Library tomorrow to talk about his mystery novels. Stephen Brayton, of Oskaloosam is the author of mystery novels Alpha and Beta, which focus on the life of female private investigator and martial arts expert Mallory Petersen. Brayton is also a fifth-degree black belt himself and will demonstrate some self-defense techniques during his visit. He’ll be at the Knoxville Public Library at 3:30 Tuesday afternoon.