In ”Moral Hazard,” Cath is a sarcastic speechwriter at a Wall Street investment bank, forced into the corporate world by her husband’s mounting medical bills. By day she navigates fiscal verbiage and the old-boy network that runs the show; by night she babysits her disintegrating, Alzheimer’s-wracked spouse in their Upper East Side apartment. But don’t expect much in the way of downtown intrigue or uptown heartache. Kate Jennings (”Snake”) was once a speechwriter herself for various Wall Street top dogs, so her tone is impressively dry and authoritative. But the story is a flatliner that fails to engage the reader.