In a world shattered by nuclear war, two children, Philip Chandler and Marlowe Hammer, are left to grow up inside a fallout shelter carved into the side of a wooded mountain. Cut off from society, they learn to read the clues of a dangerous new world through the lens of mid-century detective fiction and swing music, treating it as their mission manual and soundtrack. On April 1, 2010, a title card marks their bold, long-awaited breakout: Marlowe digs open the cave entrance, and the two friends, now teenagers, shave their hair, don sharp suits, and step into the uncertain future they’ve imagined for years.
Philip narrates the chaotic first day outside, revealing that Marlowe longs to find their missing fathers, while Philip carries the weight of believing they might be dead. The mountain has changed—trees are gone, and danger lurks in every corner. The first people they encounter are a trio of radiation-scarred mutants chasing a striking woman, Miles Archer. The rescue goes awry when Miles kisses Marlowe as a distraction and steals his gun, only to drop the crucial activation keys to the last nuclear missile. Miles departs, but the moment is followed by a brutal surprise: a biker gang of bald women with red wigs closes in, testing the boys’ resolve and their growing distrust of the world around them. The keys surface again, bearing the names of the boys’ own fathers, and the discovery fills Marlowe with excitement and Philip with a chill of doubt.
The brothers soon save another young woman, Rusty Mars, from a band of armed children they dub “disco mutants.” Rusty leads them into Edge City, a fractured, gang-plagued enclave where music and motion mask the danger roving in the streets. A dance club provides a temporary refuge, but even there trouble follows: cannibals grab for the nuclear keys, intent on exploiting the young men for their uncontaminated meat. Rusty helps them escape and apologizes for past deception, though Philip remains wary of her motives. Just as they part ways, a former ally of Miles reappears, and Miles herself reenters the fray, steering them toward her hidden sanctuary. She explains the true purpose of the keys, and though she threatens them, the trio slips away once more.
Rusty’s pursuit escalates as she trail-blazes to the hideout, where a clash with the child gangsters erupts. The moment of truth arrives when Philip, now stripped of bullets, considers shooting Miles but cannot bring himself to act. Rusty’s repentance echoes in the air as she again asks for forgiveness for her earlier lies, and Philip concedes with a wry confession that “That was a million years ago, and I got a short memory. In fact, I don't even remember who you are.”
Determined to end the cycle of violence, the pair decide to bait the city’s gangs into killing one another, staging a showdown in an abandoned warehouse. The plan mostly works, but the revelation lands hard: the leaders of the child gangsters are none other than Philip and Marlowe’s own fathers, Spade Chandler and Dash Hammer. Before the elder Chandler dies, he tells his son that the past no longer matters, a stoic acceptance that reshapes Philip’s outlook. In a final, brutal moment, Miles—still the primary obstacle—falls to Marlowe’s gun, and she is killed as Philip watches, a stark ending to a boyhood forged in isolation and survival.
The film closes with Philip embracing a newly found lightness, choosing a hopeful posture over lingering bitterness. He and Marlowe perform the post-nuclear shuffle that has become their signature, drawing a crowd as a symbol of resilience. In a closing narration, Philip envisions a future where they operate as detectives, while quietly seeking out Rusty to mend their fractured bond. The two stash the keys away in a secret place, a practical hedge against future danger: “you never know, in a tight jam a nuclear missile just might come in handy.”
