Who is the target of Injun Joe's revenge plot, and what does this compel Huck to do once he finds out? What does this reveal to us about Huck Finn?

Widow Douglass is the target of Injun Joe's revenge. Huck rushes to ask the Welshman to save her. In this, we see Huck's caring and compassion...... especially, for the widow who'd always treated him with kindness.