The Marine Biologist ends his year of city life to become a volunteer wildlife ranger, living in a restored crofter's cottage on the Hebridean island of North Uist with his dog Reuben. He enters into island life by visiting the Highland Games and fishing for salmon and trout, but as winter approaches, he must dig pear for fuel and fatten up his pigs and turkeys in time for Christmas

The Marine biologist takes a boat trip to the archipelago of St Kilda, the remotest part of the British Isles, as he continues his voluntary work as a wildlife ranger in the Outer Hebrides. He also leads nature treks along the beaches, and sets up tourist trails for visitors.

Monty has begun to restore walking trails that have been abandoned for years, but he needs to raise several thousand pounds to pay for marker posts and trail guides. He meets Niall Leveson-Gower, who runs the local hunting lodge, and hatches plans for a great feast at his hotel to raise funds.

Halls is a lucky man. Even the ferocious storms on his glorious island getaway of Uist in the Hebrides are strangely beautiful. He's halfway through his sojourn as a volunteer ranger and there's plenty to keep him busy. As part of his commitment to encourage tourists, Halls helps another ranger on the neighbouring Isle of Barra to mark a nature trail and he mesmerises schoolchildren with a lecture on sharks. But there are moments for reflection as he relaxes on the flowery sofa in the splendid isolation of his cottage and shares with us his delight in solitude.

As November starts, Monty realises that he has loads of work to do and little time left. To help open up the islands to tourists, he is writing a guide book to a series of trails. He investigates the Bonnie Prince Charlie route on horseback, following the prince's escape route from the islands in 1746 after his abortive attempt to seize the English throne. He also heads south to Vatersay, to help with an anti-erosion project, then up to Benbecula to join a hedgehog patrol, trapping this introduced and unwanted species for relocation to the mainland. Before Monty can start marking out his trails, his trusty Land Rover grinds to a halt and has to be towed away for repairs. So he sets out in a tiny hire car to mark the trail on Berneray and then heads for the shelter of a local pub, where students from the local college are practising traditional music around the inviting peat fire. He interrupts his trail-blazing to visit the final lamb sales of the year. Meeting Heather Morrison, the crofter he got his turkeys and pigs from, he finds that lamb prices are up from five to nearly 50 pounds in just one year. After weathering a power cut, Monty guns up his quad bike to research the final trail, meeting archaeologist Kirsty Macdonald on the site of an Iron Age 'wheelhouse'. Before returning to mark out the trail, Monty organises a beach clean-up, collecting 50 bags stuffed with rubbish. Then he returns to mark out the Udal trail, but a particularly lusty sledge-hammer blow lands on his foot.

Monty tries to raise funds to publish his research on walking trails and enlists the help of artist Steve Burguess. As Christmas approaches, he takes ceilidh lessons and indulges in a bit of wildlife watching, before celebrating the festive season with a dip in the sea and dinner with friends, and learning that the local ranger committee has decided to take on board his recommendations to employ a permanent ranger. Last in the series