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surroundings, you just never know. >> it started with a frightening horror movie from the 80s. >> this movie is we're gonna take some women into the wood and they will be hunted down. >> decades later something truly frightening it was happening for real. a strange vanishing in the forest. >> immediately, we knew something was wrong. >> then -- >> your heart just broke. >> surely, then meredith, two women missing and desperate efforts to find them. >> she could be alive and we just can't let up. >> could this old movie hold the key to these new cases? >> a little blood, sex, violence...

>> all that evidence from the van was added to items recovered from the dumpster outside atlanta where hilton was recovered. a georgia cop on blood mountain had found the bayonet wrestled away from gary hilton. now investigators in florida had a theory. >> what was interesting about that knife is, before we knew of mr. hilton, before he had killed ms. emerson and been caught, our analyst in our lab showed us, this is the style -- this is what the knife's going to look like. >> cameras and memory cards were found inside the van. the techie detectives in the fdle computer lab were working overti...

From the dumpster outside atlanta where hilton was recovered. a georgia cop on blood mountain had found the bayonet wrestled away from gary hilton. now investigators in florida had a theory. >> what was interesting about that knife is, before we knew of mr. hilton, before he had killed ms. emerson and been caught, our analyst in our lab showed us, this is the style -- this is what the knife's going to look like. >> cameras and memory cards were found inside the van. the techie detectives in the fdle computer lab were working overtime trying to unscramble deleted material from the evidence. and...

Emerson had wrestled away from gary hilton. now investigators in florida had a theory. >> what was interesting about that knife is, before we knew of mr. hilton, before he had killed ms. emerson and been caught, our analyst in our lab showed us, this is the style -- this is what the knife's going to look like. >> cameras and memory cards were found inside the van. the techie detectives in the fdle computer lab were working overtime trying to unscramble deleted material from the evidence. and deep in their dna lab more than 700 samples were being analyzed in an attempt to find some link between...

Trucked to the florida department of law enforcement crime lab. >> our crime scene analysts spent day and night literally, weeks. >> that van was a mess, right? >> she lived in that van for weeks. she dismantled that van. >> all that evidence from the van was added to items recovered from the dumpster outside atlanta where hilton was recovered. a georgia cop on blood mountain had found the bayonet wrestled away from gary hilton. now investigators in florida had a theory. >> what was interesting about that knife is, before we knew of mr. hilton, before he had killed ms. emerson and been caught,...