In the first part, Buck experiences violence and struggles for survival; in the second part, he proves himself a leader of the pack; the third part brings him to his death (symbolically and almost literally); and in the fourth and final part, he undergoes rebirth.
最初の部分ではバックは生きるための暴力と闘いを経験し、第2部では彼自身が群れのリーダーであると立証し、第3部は（象徴的かつほぼ文字通りに）彼のもとに死をもたらし、最終第4部で生まれ変わる。