A new hunt for the mysterious Zodiac Killer gains unprecedented access to files, unearthing a complicated cypher that may contain the killer's name, and links between the Zodiac Killer and an unsolved case. A prime suspect with code training emerges.

The hunt uncovers clues that the Zodiac Killer may have served in the U.S. Armed Forces, as the team's supercomputer identifies strange symbols in the killer's code that would have been known to only a few when it was written. Sal and Ken find new evidence that may lead to the killer.

The hunt uncovers a mysterious new cipher related to the Zodiac Killer, while the team's supercomputer uncovers a strange lunar pattern linking the killings. A taunting riddle by the killer may lead to a body. A second prime suspect emerges.

The hunt goes into high-gear as the FBI releases secret files on the mysterious Zodiac Killer, and a handwriting analyst connects the Zodiac's letters to a taunting letter mailed 3,000 miles away in Albany, NY. The code team has a massive breakthrough on the Z340.

Sal and Ken investigate San Francisco, the epicenter of the Zodiac Killer murders, as the Code Team announces extraordinary news: A team member has solved the Zodiac's infamous Z340 code, which has eluded codebreakers for 50 years.

A series of unsolved murders. A cryptic set of clues. A dead end at every corner. The serial killer known as the Zodiac long terrorized the residents of the San Francisco Bay area while taunting police. He was never caught. Now our team of investigators have identified a new suspect, and with the aid of a groundbreaking new DNA technology have the chance to come one step closer to finally solving the mystery of this murderous crime spree.

The Amityville Horror was perhaps history's most famous haunting. Nearly every known form of paranormal activity was experienced in this Long Island home. Could the spirit have returned? There are eerily similar phenomena occurring in a new location. MysteryQuest investigates using new technology built specifically for their investigation as they try to prove that these demonic spirits not only exist but have taken over.

Over thirty five years ago, Ronald DeFeo Jr. was sent to prison for a heinous crime--killing his entire family--now known as the Amityville murders. But years later, questions still circle this notorious case.