Vanished: The Surrey Schoolgirl (2018)

23 years ago a Surrey schoolgirl vanished. She left for school in the morning, never got there, was spotted that evening in local beauty spot Box Hill, then disappeared off the face of the earth - Two decades later, an ex-counter-terrorist cop living in the nearby town felt that something just didn't quite add up and started to investigate. He contacted the journalist who originally covered the story to share his suspicions and the case was reignited, bringing new facts and new witnesses to light.