The New Adventures of Lassie (2014)

S1E24 The Secrets of the Parker Clan

Graham, Zoe's father, spent his childhood in the Valley, where his grandparents were among the earliest inhabitants. Although Zoe is well-versed in her family's history, one enigma lingers: a small valley that her father frequented but never discusses, not even its whereabouts. Determined to uncover the mystery, Harvey deduces the valley's likely location. Together with Zoe and Lassie, they embark on a hike to unravel the secrets surrounding this hidden place.