Severance (2006) on Netflix

Plot summary

Palisade Defence, a military arms corporation, rewards its European sales division with a weekend of team building at a company lodge in Hungary's Mátra Mountains. A tree lies across the road and stops the bus; the driver will not take a dirt track through the woods, so the group walks the rest of the way. The lodge is old and in poor repair, and its manager, Richard, talks them into coming inside. They find a filing cabinet filled with Palisade paperwork written in Russian. Harris tells of a mental institution cleared out with a Palisade nerve gas; Jill's account is that Russian poachers and war criminals were kept there for reeducation. That evening Steve discovers a human tooth inside the meat pie, and during the night Jill spots someone watching them from the trees.