It should contain what the first chapter of what every novel should contain: the seeds of the conclusion.

It’s sometimes called the ‘author’s promise’ to the reader that they are about to read a book that will conclude with the solution to the problem that the beginning posited. That brings the beginning of the story to the end of the story. That brings the seed of that story to fruition.

Those seeds don’t have to give away what that conclusion is about. Whether it’s a good ending or bad. Just that’s the conclusion justifies the beginning.