A woman’s search for a missing cryptzoologist leads to her own riveting cosmic quest for identity.

Part documentary, part recreation, this movie is an exploration of Britain's first railway murder. Based on the book by Kate Colquhoun.

Documentary offering a fresh perspective on the question of how history will judge Donald Trump, by setting his life next to that of a controversial leader from our own past.

An epic journey around Mars — built from real satellite and rover data — revealing the red planet as you’ve never seen it before.

Susanna Reid explores a cold case enquiry into one of Britain’s most prolific serial killers. The film reveals the extraordinary game of cat and and mouse that Pembrokeshire detectives waged against the man they suspected had brutally murdered at least four people. He had eluded them for 20 years, but how would new forensics methods, and a fresh team of local detectives, now crack a case that had twice run cold?

Two dogs - a shih-tzu and a Staffie - live just one road apart, but are separated by arguably the biggest issue dividing Britain today.

A story told by ten men who fought together in the Falklands War, with unflinching honesty, discussion of life-changing moments of combat and how they have come to terms with them since.

Featuring compelling testimony, this is the story of 15 men and women and one life-changing year on the frontline of the most divisive conflict of a generation: the 1984 miners' strike

Filmed in Karasjok, Norway - 200 miles north of the Arctic Circle, BBC Four rigs a traditional reindeer sleigh with a fixed camera for a magical journey across the frozen wilderness of the Arctic. Following the path of an ancient postal route, the ride captures the traditional world of the Sami people who are indigenous to northern Scandinavia and for whom reindeer herding remains a way of life. Deliberately unhurried, the rhythmic pace of the reindeer guides us along an epic two-hour trip that takes us over undulating snowy hills, through birch forests, across a frozen lake and past traditional Sami settlements.

When 16-year-old Becky Watts went missing in 2015, it sparked a major police investigation and dominated headlines nationwide. Everyone was desperate to find the missing teenager. But only two people knew where she was – Becky’s stepbrother Nathan, and his girlfriend Shauna. Featuring incredible video footage and testimony from the police and Becky’s family, the documentary lifts the lid on the tactics that drove every step of this complex and tragic investigation and the 'cat and mouse' between the police and the suspects that played out in the interview room, and that caught the killers who thought they could get away with murder.

A journey in real time through one of the most spectacular and beautiful bus routes in Britain, the Northern Dalesman, as it snakes across the landscape of the Yorkshire Dales.

This is the untold story of Britain’s deadliest illegal gun. Charting every shooting of Gun No 6 and exposing the realities of modern gun crime.