On Saturday, Sept. 7, at 2:00 p.m., at the Lyme Public Library:  James R. Benn, author of the popular Billy Boyle World War II mystery novels which the New York Times Book Review has called “spirited wartime storytelling,” will be on hand to sign and sell copies of the latest book in the series, “When Hell Struck Twelve: The 14th Billy Boyle Mystery.”  Free.