A science teacher working on a time-travel project, who was recently diagnosed with a brain tumor, must deal with his friends and family coming to terms with his impending death while hiding the more important issue from all of them – that he has come back from the future to help himself complete his time-travel project before the brain cancer can kill him.

SYNOPSIS:

The teacher has terminal brain cancer. That much is fact. The foil is whether the version of himself from the future is a hallucination or real. And given the rules of time travel set up in the story, the timeline is mutable, meaning there is no guarantee that even if he IS real, that he solved time travel in THIS timeline.

As they collaborate, his hallucinations begin to worsen, increasing the urgency of finishing the project.

While he is in danger of becoming estranged from his wife and children in his last moments, he begins to come to a devaststing realization: in order to live, he must cure his cancer. In order to cure his cancer, he needs time travel. In order to invent time travel, he must devote all of his remaining time to it.

So does he choose to neglect the ones he loves in the short time he has left - with no real guarantee of success? Or does he spend his last moments with the people who love him most, knowing he will soon die?

Because if he succeeds, he will get all of that time back, but the rules of time travel that govern his method have made it so that even though there is a version of himself from the future in the present, it does not guarantee that the version of him from the present will become that future version.

Eventually the conclusion loops on itself in a surprising way, causing both timelines to overlap and intersect allowing both timelines to come true.

The reveal is that in his interaction with his future self, assuming it is not a hallucination, he quantum entangled his future cancer-riddled self with his past self, essentially giving himself the cancer he sought to cure.