Have you ever not minded your business and took a detailed look at strangers or listened into a conversation that others were having? From those visual clues and words that were said you might have been able to determine what was going on with those people. We do this by gathering and analyzing logical evidence to draw our conclusions of what the situation is. The same goes on when we are reading. If a reading passage gives use enough information, we can infer meaning out of where it is going. Writers often will leave a breadcrumb trail of information that we can follow and will lead us to infer meaning of where the story is heading.
The one thing we must remind ourselves through this work is that we are missing the final ending which is a significant portion of any work. You will need to look over all the evidence that is available to you and make an educated judgement as to which is the best inference you can make for all this. You can work off of the general sense of the work. Is it headed down a dark alley or is it more geared towards a happy ending? This is all up to you. Investigate to the best of your ability to seal off that ending.