26th April 1986 started as a normal quiet evening in the town of Pripyat, in the Soviet Union. Families settled themselves into bed, having no idea that a silent deadly poison would soon fill their city. As they closed their eyes that night they never expected to wake to a catastrophic horror. The worst nuclear disaster in the history of the world.

Up and down the country, thousands of children have sleepovers every single day. Some stay with friends, some with family. But what happens when instead of going home, they vanish? Into thin air..

In the case of Tia Sharp, her mum said it was almost like she walked out the door and fell down a hole. But she was about to learn the truth was far, far more disturbing than that. More disturbing than anyone could EVER have imagined.

It’s supposed to be a place of thrills, laughter, and unforgettable memories. But in summer 2015, an afternoon at Alton Towers, turned into a living nightmare.

One rollercoaster - The Smiler - came to a catastrophic halt and what followed was one of the most serious roller coaster accidents in UK history.

It was supposed to be the trip of a lifetime - a solo adventure across the world. About to turn 22, Grace Millane had her whole life ahead of her. But what began as a night out in Auckland, would end in silence. A missing persons report, and a journey cut brutally short.

Morgan Metzer slipped away early from the New Year's Eve celebrations.

She wasn’t in the mood to celebrate - it had been a tough year.

She would happily trade the noise of fireworks for the quiet comfort of her own bed.

The night should’ve ended peacefully. But she had no idea of the terror that was about to unfold, right there in her home.

A figure dressed in black was watching.. and waiting.

She vanished without a trace… leaving behind a series of messages that painted a picture of fear, confusion, and someone clearly in distress. In the hours before she disappeared, something wasn’t right. She was asking for help, running from something, or someone. And when her body was finally found, the question wasn’t just what happened to Gaia Pope… but who or what had she been so afraid of?

She became one of the most talked-about faces on TV — the centre of a show built on shock, secrecy, and a twist that left viewers stunned. But when the cameras stopped rolling, things got even darker.

Years later, her story would end in circumstances so disturbing that people still question what really happened. This is the haunting story of the rise and fall of a beautiful reality star whose fame came at the ultimate price.

It started out as a simple psychological study..

What would happen if a bunch of students played prisons?

But The Stanford Prison experiment spiralled so far out of control that the stories are still told to this day in lecture halls.. over 50 years on.

The experiment posed the question.. are we really all capable of evil? In certain circumstances.. how far are we willing to go?