Final answer:
In the book "Night" by Elie Wiesel, Elie catches Idek engaging in a sexual encounter with a female prisoner at the Buna concentration camp.
Step-by-step explanation:
In the book "Night" by Elie Wiesel, Elie catches Idek engaging in a sexual encounter with a female prisoner. This happens at the Buna concentration camp, where Idek is the Kapo, or prisoner overseer. Elie witnesses this act while he is working in the electrical warehouse.