A young woman in the midst of cancer treatment goes on a road trip in a broken down el camino with her no-good ex-boyfriend. A man working as a ghoul at a sort of halloween theme park learns that his whole life has been a lie. A gay man is forced to come out over and over again to his senile misogynist father. A mother’s moral outrage on behalf of her son goes seriously awry. Two new collections of short stories tell stories about people living on the edge of a society that is failing them. George Saunders’ “Liberation Day” is filled with wry humor, even as his characters are often trapped by their own foolishness. The characters in Jess Walter’s collection, “The Angel of Rome,” are often filled with humor and hope, even as they struggle against poverty and indifference. OPB’s Geoff Norcross talks to Saunders and Walter about the art of writing short stories about our time.