The Boy in Striped Pajamas chapters 17-20

I found these last chapter were also sad. I thought that these chapters were sad because Bruno was going to go back to Berlin which means that Bruno will not see Shmuel again. That was sad because Bruno was talking with Shmuel for a year, and Bruno has to leave the concentration camp and never see Shmuel again. It was also sad that Shmuel's father disappeared and couldn't be found. That was sad because Shmuel had lots of things taken away from him. One thing taken away from Shmuel was his life before going to the concentration camp. Yet another thing that was sad was that Bruno would be without a father if he went back to Berlin. That would be sad because Bruno likes his father. The last thing that was sad was that Bruno and Shmuel both died. That was sad because those two were the main two characters and they both died from the poisonous gas. This is why I found these last chapters to be extremely sad.