Executive Producers Matt Frederick and Trevor Young sit down for an exclusive behind-the-scenes conversation about the makings of the Monster series. Get the scoop from the beginning and find out how a one-off investigation into a serial killer in Atlanta became an award-winning global podcast franchise.

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More suspects bring more questions.

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A frightening final theory.

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New technology brings fresh hope to the Zodiac case. But what if it's still a dead end? 

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Fascination leads beyond obsession, as a new Zodiac emerges in New York City. 

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New theories bring new suspects. But for many independent investigators, those theories are truth. 

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Toschi's investigation led to a dead end, but independent investigators are chasing down other leads. 

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What if the story you've heard about the Zodiac is not the real story? It's time to separate fact from fiction. 

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Investigators finally put a name and face to the Zodiac. The prime suspect is revealed. 

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A close encounter with the Zodiac sends investigators to Riverside, California.

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After an impromptu TV appearance, the Zodiac fights to stay in the limelight 

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