The action really picks up in a scene where Caleb, the family's eldest son, goes missing in the forest. While his sister Thomasin desperately tries to find him, we watch as he meets the witch herself. Although she appears old and bedraggled in the first scene of the movie, the witch in this sequence is young, beautiful, and utterly entrancing. She approaches Caleb, and just as she gives him a tender kiss, an awful, decrepit arm grabs him.
Flash-forward to the evening. Thomasin has reunited with her father. A storm rages outside. Thomasin goes outside to feed the animals, and she finds Caleb, naked and slumped against the fence. His body is contorting in strange and awful ways.
Caleb grows very, very sick. In one of the film's most disturbing sequences, his fever pitches and he writhes, completely under the witch's awful spell. He chokes and regurgitates a full, unharmed apple. He begins chanting in religious tongues. He reaches what can only be described as religious ecstasy, but it's clear that Satan himself soon takes over in some sort of horrific demonic possession. Caleb falls limp to the floor, dead.