Ex-Pinkerton and ex-Union Army sharpshooter, Oliver Redcastle, is hired to find a kidnapped boy. His search takes him to the mean streets of Baltimore in 1884. It also leads him to the city's dangerous harbor where many unwary immigrants are sacrificed in the "Oyster Wars" that rage on the Chesapeake bay in this contentious period of American history. To save a child, Oliver must confront grave-robbers, mediums, unscrupulous physicians, a mad scientist and the "ghost of an old love." Before his mission is complete he even has to out-shoot Annie Oakley.