Chapter 6 of the book Of Mice and Men is about the tragic ending of the story. The main ideas are:

1. Lennie accidentally kills Curley’s wife and runs away to their hiding spot by the river.

2. George finds Lennie and knows that he will be punished severely for what he has done.

3. George decides to take matters into his own hands and shoots Lennie to spare him from a painful death.

4. The other men find out what has happened and are angry with George for taking justice into his own hands.

5. George is left alone and devastated by the loss of his friend.

The chapter shows the consequences of actions and the importance of making difficult decisions. It also highlights the theme of loneliness and the bond between friends.