This part of the story takes place at a gas station bathroom. Dennis and Mac see what appears to be one of "them". Dennis and Mac find a little boy named Jeremiah. They then find a girl being attacked by one of the plagued and take her with them.
Anna has a big gash on her leg and needed it to be repaired . Anna was worried that she would be one of them. Mac thought otherwise. They went to sleep and when Mac woke up Anna was gone
I think Anna has become one of them and ran away. Dennis, Mac, and Jeremiah will look for her and probably one of them will die in the process.