Season
Episode
- Episode 1: Yakima Canutt's Saddle; The Ni'ihau Incident; Civil War Cannon
- Episode 2: Spanish Civil War Eulogy; Word War II Leaflets; Tiffany Window
- Episode 3: Siberian Bullet; John Brown Pike; Ronald McDonald Costume
- Episode 4: African American Comic Book; Lindberg-Sikorsky Fabric; Civil War Letters
- Episode 5: Drone Propeller; Clara Barton Letter; Teddy Roosevelt War Club
- Episode 6: Baker's Gold; Kittery Telescope; Japanese Carved Cane
- Episode 7: Andrew Jackson's Mouth; Modoc Basket; Hot Town Poster
- Episode 8: Drug Smuggling Doll; Florida Map; Marion Carpenter Camera
- Episode 9: 1775 Almanac; Exercise Records; Moon Museum
- Episode 10: Leopold Medal; Suffrage Pennant; WB Cartoons
- Episode 11: Continental Club Card; Saint Valentine's Day Massacre; Society Circus Program
- Episode 12: Ince Ledger; Harlem Heirs; Chandler Tintype
History Detectives Season 9 1775 Almanac; Exercise Records; Moon Museum
A group of researchers help people to find answers to various historical questions they have, usually centering around a family heirloom, an old house or other historic object or structure. It devotes itself "to exploring the complexities of historical mysteries, searching out the facts, myths and conundrums that connect local folklore, family legends and interesting objects."
