Michael Kilian 
Ironclad Alibi [EPUB ebook] 

Raines goes behind enemy lines to investigate a Confederate ship in this “colorful and exciting” mystery “that entertains from start to finish” (Publishers Weekly). It’s been years since Harrison Raines set foot in Richmond. Although a proud Virginian, he fled the South before the Civil War, unable to bear the evil of slavery. In 1862, battles rage on all sides of the Confederate capital, but Raines is not here as a soldier—he comes as a spy. Union intelligence, led by the formidable Allen Pinkerton, has sent him to steal the plans for a rumored Confederate superweapon: a seagoing ship clad entirely in iron that could break the Union blockade and turn the war around. Raines may be in home territory, but he is not at ease. In Richmond, they hang spies.   While investigating the ship known as “the Monster, ” Raines’s closest friend—a freed slave named Caesar Augustus—is arrested for murder. Saving Augustus from the gallows will take quick wit, daring, and influence at the highest levels of the Confederacy.  The Ironclad Alibi is the 3rd book in the Harrison Raines Civil War Mysteries, but you may enjoy reading the series in any order.