John Craven and Sean Fletcher are in Mid Wales around the Dyfi river, exploring the hidden stories of wildlife that flock to the area at this time of year - and the people ready to welcome them. It's a true patchwork of habitats; salt marshes, mudflats, ancient woodlands and farmland. It's so special that it's been designated by the United Nations as part of a larger regional biosphere - one of only seven such places in the UK - due to its amazing wildlife and landscapes. John comes face to face with the visiting celebrity couple of breeding Ospreys who have made the area world-famous, as well as the conservation work to help the migrant pied flycatchers, fresh from their over 3000-mile journey from west Africa. To celebrate VE day, a local historian reveals the intriguing tale of a group of female army personnel brought to the area to conduct top secret work that was invaluable to the war effort. Meanwhile, Sean spends the day working on a nearby upland farm, where making a living while farming for wildlife is a constant challenge. And further afield, Adam is all abuzz for his latest new arrival - an army of bees he's hoping will prevent another expensive crop failure.