History Detectives stares down the barrel of a shotgun for clues that one of Al Capone's men fired it in a Chicago gang massacre that shocked the nation. Wes Cowan sets out to discover whether an artist painted a portrait of Washington from life, and to uncover its surprising connection to the little-known abolitionists and patriot, White Matlack. Eduardo Pagan uncovers a stoic act of defiance and dignity behind the Stalag's barbwire.