In Jodi Picoult's novel "Mercy," the narrative delves into the complex nature of mercy and the moral dilemmas that accompany it. The story explores the limits of human law and justice, particularly in the face of personal tragedy and ethical quandaries. The characters wrestle with difficult decisions that challenge their values and the very essence of compassion.

The impactful quote, "There are some weapons you can't protect yourself against," reflects the idea that emotional and moral pain can be as damaging as physical threats. This concept serves as a catalyst for the characters' decisions, illustrating how some challenges are unavoidable despite efforts to shield oneself from harm.