S05:É04 - S05:E04 - A Voice From Beyond

When a decomposed body is found stuffed in a barrel, it's easy to presume murder. But the body had been placed in the barrel 30 years earlier. One of the few clues was an address book found along with the body, but years of moisture had washed away the ink, which was completely gone. Scientists desperately searched for a way to reveal the information written on the pages of the address book.