A magical film about the mysteries of childhood and a 1000-year-old custom. Tom, Sebastian and Paul are children from very different families. They live in a small village in Mansfelder Land, an area marked by the decline of mining. A huge, black slag heap still towers over the village like a mountain range, a reminder of the bygone era. However, an archaic custom has remained over the centuries and the three boys play a crucial role in it.