In the first week of publication of Erik Larson's latest book, "The Demon of Unrest," sales put it at the very top of the bestseller list. It's about the start of the Civil War, with a focus on the five months between Abraham Lincoln's election and the day of the first shot fired on Fort Sumter, which is off the coast of Charleston, South Carolina. That was April 12, 1861. In his introduction, Erik Larson writes: "I invite you now to step into the past, to that time of fear and dissension…I suspect your sense of dread will be all the more pronounced in light of today's political discord…"

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