“When you spend so long trapped in darkness, Lucien, you find that the darkness begins to stare back.” - Feyre
Feyre is hunting in the woods. She is the main reason her family has survived so long, she needs to find food or they wont survive. In the woods she sees a deer and with it a wolf. When she decides to kill it and sell the fur, she has made one of her biggest mistakes - taking a life, requires a life in return. And the collector of that debt will be coming for her soon.