What are the motifs in Postcards from No Man's Land by Aidan Chambers?

Death is a recurring idea in the novel. When Jacob's character is first introduced, the reader learns almost immediately that he struggles with depression. It soon becomes clear that his depression is a result of feeling misunderstood, perhaps even to himself. He feels extreme guilt that he is alive - and living a "worthless" existence -while the girl he loves, Anne Frank, is dead. Jacob's suicidal "mouse moods" are brought on by feelings of indecisiveness, fear that his indecision proves he shouldn't be allowed to live.