Writing a novel in a week requires intense focus and discipline. First, decide on the genre and theme. Then, break your time into chunks for writing, editing, and proofreading.
Well, it's tough but possible. You need to have a clear outline first. Then, set a daily writing goal and stick to it. Cut out distractions and focus purely on the writing.
It might imply that in the creation of a novel, the author experiences some sort of 'trouble' each week during the writing process. It could be related to plot development, character creation, or dealing with writer's block. So, 'one week one trouble' during the writing of the novel.
It's hard to say for sure. Different sources might have different top picks. Maybe a newly released bestseller or a classic that's regained popularity could be number one. Check out reviews and bestseller lists to find out.