The once-grand Cecil Hotel provides a nightmarish backdrop for the disappearance of Elisa Lam. Her final footage in an elevator triggers a viral hunt.
Web sleuths dissect Elisa's social media posts. A grisly discovery changes everything at the hotel already known as the Night Stalker's onetime lair.
The mystery deepens: Did a crime occur? The obsessed descend on the Cecil hoping to solve the case and tumble down the rabbit hole of conspiracy.
A long-awaited autopsy report arrives, but suspicions linger. Today, an unlikely target speaks his mind as experts weigh in on persistent mysteries.
Bright lights, fear city: In Times Square, 1979, police stumble on a fiery "hotel room from hell" housing the bodies of two women.
After another grisly murder, officers talk to sex workers and examine their clients' records. Meanwhile, eerily similar killings occur in New Jersey.
Days after a woman's harrowing escape, NJ police build a case. NYC officers connect the dots as trophies come to light. A daughter looks for closure.
Skeletons are found in a field — an area where women have disappeared since the 1970s — and a Texas community fears there's a serial killer at work.
The case of a missing 12-year-old gets media attention, while more bodies turn up. Investigators have a profile of the killer and suspects emerge.
Pieces of the puzzle come together when an abducted woman jumps from a moving vehicle and new evidence from an old case points to a suspect.
A body in the darkroom of a gay bar puts Berlin police on the trail of a killer who poisons and robs his targets - but is he only in it for the money?
With Berlin's gay nightclub scene reeling from the murder, the investigation into the killer's identity reopens a previously closed case.
As the body count rises a break in the investigation brings the killer's dark past into the focus as the police close in on him.
