History Detectives: Chicago Clock, Universal Friends, War Dog Letter

America's top gumshoes are back to prove once again that an object found in an attic or backyard might be anything but ordinary.

Wesley Cowan, independent appraiser and auctioneer; Gwendolyn Wright, historian and professor of architecture, Columbia University; Elyse Luray, independent appraiser and expert in art history; Dr. Eduardo Pagán, professor of history and American studies at Arizona State University; and Tukufu Zuberi, professor of sociology and the director of the Center for Africana Studies at the University of Pennsylvania, leave no stone unturned as they travel around the country to explore the stories behind local folklore, prominent figures and family legends.

"Chicago Clock" - A Michigan woman wonders if her family clock kept time for the entire Midwest during the 19th century. The search takes HISTORY DETECTIVES host Elyse Luray back to the industrial age when the country first began regulating time.

"Universal Friends" - Then, a document seems connected to an early controversial religion -- the first religion founded by an American-born woman. HISTORY DETECTIVES's Gwen Wright wants to know why her name is missing from this critical record, the "Incorporation of the Universal Friends Church."

"War Dog Letter" - And, in an encore segment, detective Tukufu Zuberi heads to Cat Island, near Gulfport, to find out what went wrong with a WWII dog-training program there.