The climax of John Steinbeck's novel "Of Mice and Men" is the death of Lenny. All the strife and struggles, as well as shared good times and dreams that George and Lenny have had together come to an end in this death scene. George is seeking to protect Lenny from the murderous, vengeful mod that is on the hunt. George cannot bear to see Lenny taken by them as he truly does care for and love Lenny. He feels he is Lenny's protector, so, therefore, this is his final act of protection for Lenny. This is an extremely powerful conclusion to the story and is one that lingers with the reader (or movie watcher0 long afterwards. I myself often think of the ending of this story - how it wrapped up the story surprisingly and fittingly. This ending haunts one afterwards because of its emotional impact. Therefore, it is a true, well-constructed climax by John Steinbeck.