On a ravaged Earth, Paul, a devoted father, lives with his twin sons in the Arcadian, a seemingly ordinary home surrounded by a desolate landscape. The once-thriving world has been decimated by an unspecified cataclysmic event, plunging humanity into darkness and despair. Under the blistering sun, daily life is threatened by ferocious, mutated creatures, born from the DNA of a long-lost species, that roam the ruins by night. This era is as harsh as the land itself, with scrawny plants growing from the cracked earth and barren trees looming like specters above. Paul and his sons, Alex and Lucas, must defend themselves every night by remaining vigilant and sharp, an essential skill set taught to them by their father. The trio navigates the perils of this haunting world from the confines of their fortified Arcadian home. Over the years, Paul has transformed this underground haven, an underground bunker into a remarkably elaborate home fit with renewable energy systems, rainwater collection, and advanced defenses, where they safeguard themselves for night's fall. Anywhere the family steps outside during the day, everything is not well. Wild forests destroyed, deserted streets run void of life, towns disabandoned and windbreakers loiter a hollow wind, almost still. Only a handful of other human victims exist and every encounter is fraught with peril. For their sake, they hardly make it through. The vulnerability is realized when Paul faces the dark creatures. Their claws rip through the family's outdoor safety, allowing a particularly fearsome beast to maim the loving father. In a nightmare future resembling that of George Miller, Mad Max, the boys – surviving, resourceful, scared - seek determination, seeking every last bit of strength, in order to revive their loved father. They learn everything their father taught them in one week, putting that information to the test to revive him. Harnessing skills the father displayed to save his sons multiple times each over the final years - one learns where basic power is gathered, water preserved and, crucially skillful combat such as their fire-defense – the double tries and fails to come up with the one great plan and at last each of the boys takes turns to figure out with a glimmer of hope how to revive him. Using intuition and grit to work through their father's teachings, they both realize and carefully review how tiny ways in which their lives depend on the home and even life itself that these minor strategies can eventually present a great plan. In doing so, they're united by an understanding that comes simultaneously deepening the two bond. They move unflaggingly towards reclaiming their endangered family. Their courageous spirit finally instills victory as they locate their father weakly lying in the unforgiving heat and lift him, each using their exceptional abilities combined: Alex uses the solar energy collected to heat a makeshift stove; meanwhile Lucas, having studied their father's self-defense, shields the recovering Paul from unsuspecting larger threats returning as night beckons. Throughout a nightmare that may eventually form an inescapable bond between those family members who are left, hope awakens anew as these boys understand that together - with their strength growing through love for family - they find it possible to finally navigate the harsh new world in the knowledge that both their determination and effort prove as valuable as the skills and shelter the defeated father taught them.