In this new series, Ellie Harrison and Adam Henson explore hidden corners of the UK, hunting for secrets hidden in the landscape, inspired by suggestions from Countryfile viewers. Adam and Ellie meet people living in the countryside who have extraordinary stories and stunning sights to share, while the pair also reveal some secrets of their own. In this first episode, Ellie and Adam visit south Wales to explore the unseen water world at the heart of the Brecon Beacons. Adam discovers a completely hidden path, a magical walkway behind a glorious waterfall. Ellie confronts her own secret fear of tight spaces as she ventures into Britain's deepest cave, a terrifying labyrinth of passages carved through solid rock by an ancient underground river. Ellie is in search of extraordinary crystal formations that few have ever seen. Adam and Ellie also hunt for a forgotten 'witches' pool', a beautiful pond fed by a waterfall that conceals a terrible secret in the heart of its dark waters. Ellie shares her passion for wild swimming as she plunges into an enchanted fairy pool concealed high in the mountains of the Brecon Beacons. Along the way we meet a couple whose lives were transformed when they risked everything to buy a historic toll bridge over the river Wye. Can they make this 200-year-old crossing pay its way today? The journey reaches an awe-inspiring climax with an ascent by balloon at dawn. As the sun rises over the peaks and lakes of southern Wales, this landscape - steeped in legend and mythology - is brought magically to life by a latter-day poet, who takes Adam and Ellie on an exquisite aerial tour of the secret delights of the Brecon Beacons.

Ellie and Adam go on a journey around the mysterious moors of North Yorkshire. Adam meets the farmer whose dad discovered a secret Roman villa some 50 years ago while ploughing. Finds of Roman pottery inspire Adam to share his secret skill with the potter's wheel. Ellie tries to solve the puzzle behind Britain's highest pub - why was the Tan Hill Inn built atop the moor, miles from the nearest customers? The secret lies buried in centuries-old mine workings, if only Ellie can find them. Now the Tan Hill Inn has reinvented itself as a cool music venue, which leads Ellie to reveal her own secret past as a country singer. In the picturesque Rosedale Valley, Adam discovers the remains of a forgotten glass-making industry scattered in the bracken. Why were French immigrants making glass in secret on the Yorkshire moor some 400 years ago? A teenage boy whose ambition is to be become a gamekeeper shares his favourite secret places in the breathtaking Yorkshire countryside as he takes his pet ferret to work the land looking for rabbits. The best kept secret in Whitby is the unseen warren of back alleys and hidden gardens, known locally as the Whitby Yards. Ellie investigates how these former slums have now become highly sought after havens of peace. As she visits the remarkable ruins of Rievaulx Abbey, Ellie discovers, hidden from the public gaze, the long lost faces of the men who built it. Adam and Ellie's journey reaches a climax with the hunt for Yorkshire's finest view. The author of All Creatures Great and Small famously claimed that it's from Whitestone Cliff, next to the majestic Sutton Bank - but can Adam and Ellie find a view that's even better and, above all, secret?

The final episode of this series sees Ellie Harrison and Adam Henson explore the hidden highlands of Scotland. Inspired by suggestions from viewers of Countryfile, Adam and Ellie meet people living in Britain's countryside who have extraordinary stories and stunning sights to share. The pair also reveal some secrets of their own. Adam climbs the fearsome, secret side of Ben Nevis, the north face, a spectacular rock ascent onto which few tourists venture. Adam joins a mountain guide to tackle this hidden route to the summit, but the route is far from the only secret they find along the way. Adam also discovers the ruins of a remarkable abandoned weather station. Ellie probes a monster mystery at the heart of Britain's deepest water, Loch Morar, the secret sister of the world-famous Loch Ness. The stunningly beautiful Loch Morar is so deep that it could even hide the Eiffel Tower, but Ellie meets locals who believe the water actually conceals a monster, known as Morag. The most extraordinary map of Scotland is also revealed, overgrown and hidden in the landscape. In the heart of the Highlands, Adam is delighted to discover a cattle ranch that allows him to live out a boyhood dream; while on the Black Isle Ellie visits the mysterious and atmospheric Clootie Well. It's been a shrine to healing since Celtic times, but why are its ancient rituals still popular today? Together Ellie and Adam also go hunting for Bonnie Prince Charlie's secret hideaway, a tiny but timeless cave in the very same landscape where commando warfare was invented during the Second World War. And they conclude their journey of discovery with a magical ride on the real Hogwarts Express.