Book excerpt: "The Demon of Unrest" by Erik Larson

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"The Demon of Unrest" (Crown), the latest book by Erik Larson (the New York Times bestselling author of "The Splendid and the Vile"), is a riveting account of the months leading up to the Confederate forces' attack on Fort Sumter, the first shots fired in the Civil War.

Read an excerpt below, and don't miss Anthony Mason's interview with Erik Larson on "CBS News Sunday Morning" April 28!