Monday, July 6, 9 pm
St. Valentine's Day Massacre: 
The detectives stare 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. Booth Letter: A contributor offers a letter indicating that, 30 years before John Wilkes Booth assassinated Abraham Lincoln, Booth's father threatened to kill another sitting president, Andrew Jackson. Cemetery Alarm: A Midland, Michigan, man snapped up an item at an estate auction that looked like a Civil War-era weapon.

Monday, July 13, 9 pm
Sideshow Babies
Elyse Luray learns about the forgotten doctor who brought life-saving incubator technology to the United States at the turn of the 20th century. Lubin Photos: Host Tukufu Zuberi takes viewers on an excursion through an early movie mogul's dramatic rise and fall. Navajo Rug: At auction, a contributor bought a rug whose woven designs intrigued him. Guest host Eduardo Pagan visits a textile historian to find out who may have been behind this controversial design.

Monday, July 20, 9 pm
Tokyo Rose Recording
A viewer has a recording he thinks holds evidence used in the World War II treason trial of Iva Tugori, aka Tokyo Rose. Crazy Horse Photo: Does a contributor have the Holy Grail of the Wild West: a photo of the Crazy Horse, the Lakota warrior who defeated General Custer? WWII Diary: A man in Lexington, North Carolina, has a poignant diary written by a World War II pilot. Host Wes Cowan heads to Florida on a quest to reunite the diary with the pilot's surviving family.

Monday, July 27, 9 pm
Amelia Earhart Plane
John Ott believes he may have a piece of Amelia Earhart's airplane, the missing Lockheed L-10E Electra in which she made her ill-fated around-the-world attempt. Fillmore Pardon: A Portland, Oregon, man inherited what looked to be a U.S. presidential pardon signed by Millard Fillmore in 1851. Boxcar Home: When a Lakewood, Colorado, couple found a new home, they noticed odd supports in the basement ceiling.