Mystic Fire: A Bonanza/Civil War novel

Lincoln's war comes to the Ponderosa when "runaway slaves" come to Nevada for help. They don't want to be sent to other countries. Adam is kidnapped with one by slavers, and Ben takes the trip to New Orleans with others to talk to Lincoln. Hoss comes to the rescue of a woman who insists her husband is trying to kill her, but Hop Sing thinks she's already dead. And Joe, with Ben and Adam missing, has to deal with cattle thieves alone. The Civil War splinters the country -- and the Cartwrights.