Park in the centre of Theys, in one of the two car parks before the town hall, at the first crossroads in the village.
(S/E) From the car park in Theys, walk up towards the church and town hall and continue on the left, on the Col du Barioz road (D280), for about 1 km.
(1) On leaving the village (road sign), in a right-hand bend, leave the road and take a path that goes straight up towards a telephone mast, visible higher up the slope.
(2) At the antenna, join a small tarmac road, which you follow to the left until it ends, after it has turned into a wide track.
(3) At the "Côte Biron" sign, follow a horizontal path to the right towards La Villette, which becomes a small road in the same general direction. Pass through the hamlets of Les Adrets, then La Villette and finally Les Bruns, staying on the same side of the valley, above the Col du Barioz road.
(4) At the exit of the hamlet of Les Bruns, leave the small road, as it descends to the right, and take the large path that continues straight ahead and runs alongside a wetland area on the right: the Marais des Bruns. Turn right to reach the hamlet of Les Vincents and the Col du Barioz road again.
(5) Go up to the left for about 100 m, passing a small chapel dedicated to Our Lady of Lourdes on the left. Almost opposite, a tarmac road climbs up the opposite slope. Follow it around two bends, left then right, to find a path climbing straight up the slope between two hedges. It joins a small tarmac road.
(6) Take this small road to the right to begin the return journey to Theys, staying on the same slope all the way, above the Col du Barioz road.
(7) Leave this small road at its first bend, after only about 200 metres, and take a path on the right that descends steeply. (It is possible to stay on the small road, cross the Chaboud and rejoin the route described in the next hamlet, L'Envers). The path joins a tarmac road at the Belle Étoile farm (sign). Follow this gently sloping tarmac road, continuing in the same general direction (south-west) until you reach the hamlet of Malbuisson, above Theys.
(8) Continue in the same direction. The road descends sharply in a right-hand bend. Cross the D280 to enter old Theys via Rue du Merdaret, which takes you back to the church, from where you can reach the car park 100 m further on (S/E).