Errol Morris is a legendary fact-hunting documentary sleuth. His film The Thin Blue Line has been credited with overturning a murder conviction, and freeing an accused man from a death sentence. For him, the search for truth shouldn't stop short of insanity. He tells Jad and Robert a story about his obsession with one particular photograph. Taken in 1855 during the Crimean War, the photo -- titled "The Valley of the Shadow of Death" by its photographer, Roger Fenton -- is one of the first photos ever taken of war. And it may also hold the title of First Faked Shot.

As Errol explains, it turns out there were actually two photos -- both taken from the same spot over 150 years ago. One image famously shows a road littered with cannonballs, while the other shows the same road with no cannonballs (they're off to the side in ditches). Which one came first? And why would the cannonballs have been moved?

On the road:

(Photo restoration by Dennis Purcell. Click to zoom.)

And off the road:

(Photo restoration by Dennis Purcell. Click to zoom.)

After attacking the question every way he could, including traveling to the Crimea, Errol turns to his friend Dennis Purcell, an optical engineer, for help. After hours and hours of scrutinizing, Dennis solves the puzzle. But what Errol ends up finding isn't a straightforward correction to the historic record... but a surprisingly personal connection to one lost moment of reality.

Also check out:

Errol Morris's new book, A Wilderness of Error