The Golden Calf (2017)

In the 1940s, a group of school children and their teacher mysteriously disappear in an underground labyrinth. In the present day, and after finding an ancient treasure map, two cousins embark on a treasure hunt full of mystery. After uncovering a number of clues, the children end up in the same labyrinth where the 1940s children had vanished. The cousins' adventure leads them to face various dangers (and maybe even ghosts!), but also to unearth important family secrets. Ultimately the children's greatest adventure is realizing the real value of family.