What is the theme of this narrative? does the style support the theme, why or why not? ?

Can someone me answer this english question

Key events - what happens? what do we learn about the character in this event? or how does the event change the character? what is the author’s message in each set of events you have identified? 1.bruno and his family move from berlin to auschwitz due to the move he learns of the camp which leads to another key event. 2.bruno meets shmuel when they meet, they become friends which in turn towards the end leads to their untimely demise.

How did the man from "to build a fire" put his life in danger?