S1, E3: The team locates a curious new cipher associated with the Zodiac Killer, while the supercomputer identifies an odd lunar pattern that connects the killings. Plus, a riddle left by the killer may reveal the location of a body.


S1, E3: The team locates a curious new cipher associated with the Zodiac Killer, while the supercomputer identifies an odd lunar pattern that connects the killings. Plus, a riddle left by the killer may reveal the location of a body.