Chloe and Max leave a decimated Arcadia Bay. While trying to let go of the past, Max's powers continue to evolve without her consent, and it becomes clear that the past isn't done with them yet. Ominous visions lead the pair back to the Tobanaga, and they find themselves unraveling a mystery they can barely comprehend. It turns out that a few uneducated teenagers spouting out the words "chaos theory" may not have been the answer all along.