I'm not entirely sure as there could be many novels with the term 'war room' in the title. It might be about military strategies and operations that are planned in a war room setting.
I'm not entirely sure which specific 'war the enormous room novel' you are referring to. There could be many novels with war themes and the phrase 'enormous room' might be symbolic within the context of that particular work, perhaps representing a large space of chaos or a complex situation during the war.
A 'war room story' might also be in a business context. For example, in a high - stakes business deal, the war room could be where the top executives gather to plan their marketing strategies, deal with competitors' moves and figure out how to gain an edge in the market. They analyze data, discuss different scenarios and make crucial decisions to win in the business 'battle'.