Monday, August 18, 9-10 pm ET
A book that may have been a gift from John Adams to his son; a spoon that depicts an eerie scene; and a small square of fabric that may have come from a U.S. Navy “flying boat.”

John Adams Book - A woman in Littleton, New Hampshire, inherited her husband's aunt's belongings, which include a curious late-18th-century book titled Trials of Patriots. It contains what appears to be President John Adams' signature in three places, and includes an inscription, "Charles Adams from His Father, 1794." The book is a collection of transcripts chronicling the sedition trials of Irish and Scottish radicals. If the book is indeed from Adams to his son, it could reveal pivotal clues about the inner workings of this presidential family. In Boston and John Adams' hometown of Quincy, Massachusetts, HISTORY DETECTIVES host Gwendolyn Wright examines the Adams family's correspondence and conflict as they balanced home life with public service.

Mankato Spoon - A woman in Portland, Oregon, has a curious spoon that once belonged to her grandmother. It's known in her family as "the spoon of atrocities." An eerie scene is etched into its sterling silver bowl: wagons, buildings and a crowd of spectators gathered before a gallows with figures hanging from them. A disturbing message is inscribed: "Hanging 38 Sioux In 1862 Mankato, Minn." What is this tragic scene and why has it been etched into what looks like a commemorative spoon? HISTORY DETECTIVES host Wes Cowan travels to Mankato, New Ulm and Minneapolis, Minnesota, to explore the clash between white settlers and Sioux in the mid-19th century - and a struggle that led to the largest mass execution in American history.

NC-4: First Across the Atlantic - Almost 10 years before Charles Lindbergh's famous solo flight across the Atlantic, the NC-4 was the first aircraft to make the transatlantic journey in May 1919. A woman in Saratoga, California, has a small square of canvas-like fabric that she believes comes from the NC-4, one of four U.S. Navy "flying boats" that had originally been commissioned to alert American destroyers to the locations of German U-boat submarines that were wreaking havoc on merchant ships along the U.S. coast during World War I. Due to early mechanical problems, the NC-4 was considered by many aviation insiders to be the least likely candidate to complete the trek across the Atlantic. In Pensacola, Florida, and Hammondsport, New York, HISTORY DETECTIVES host Elyse Luray investigates the little-known story of the NC-4 and its historic voyage. (Repeat from #506, OB: 7/30/07)