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The Manhattan Project

Dr. John Mathewson discovers a new process for refining plutonium to purities greater than 99.997 percent. The United States government provides him a laboratory located in Ithaca, New York, masked as a medical company. John moves to Ithaca and meets real estate agent Elizabeth Stephens while searching for an apartment. He attempts to win the affections of the single mother by inviting her teenage son Paul to take a tour of the lab. John is confident in the lab's cover story but Paul, an unusually gifted student with a passion for science, becomes suspicious when he discovers a statistically impossible patch of five-leaf clover on the grounds.

Paul and his aspiring journalist girlfriend, Jenny Anderman, decide to expose the weapons factory to the media, stealing a container of plutonium as evidence. Once they succeed, Paul declares that the plutonium alone is insufficient, as no-one would be impressed by two kids stealing something from a lab. Instead, he convinces Jenny he can create the world's first privately built nuclear device, exposing the lab to the world by audaciously entering it into the New York Science Fair. After convincing his mother and his school that his project is about hamsters bred in darkness, he begins research and construction of the bomb.

The lab discovers that a container of plutonium has been replaced by a bottle of shampoo mixed with glitter. A military investigation team, led by Lt. Colonel Conroy, arrives on the scene and determines that Paul is responsible for stealing the plutonium. Suspecting him of terrorist intent, the investigators search Paul's home and discover that he and Jenny have left for the science fair.

After the agents capture the couple in New York City, John, who feels personally responsible for the crisis, talks privately with Paul and persuades him to give the bomb to the agents before a group of other participants at the science fair help Paul and Jenny escape from the hotel.

In an effort to expose the lab, Paul hatches a plan to return the bomb on his own terms. Ensuring Jenny is a safe distance away, he calls the agents from a pay phone and walks into the lab with the bomb while being surrounded by snipers and agents. During the standoff, negotiations stall and Paul arms the bomb. John, convinced that Paul is not an actual terrorist, attempts to intercede on his behalf.

Due to radiation from the plutonium, the bomb's timer activates on its own and begins to count down with increasing speed. Paul suggests taking the bomb to a quarry outside of town, but John admits that he had not fully understood the ramifications of his plutonium refining process. As a result, Paul's bomb will have a nuclear blast yield nearly five times larger than the one that destroyed Hiroshima if it detonates.

Desperate to defuse the bomb, all sides put down their weapons and frantically work as a team to dismantle it. They manage to disarm the bomb a fraction of a second before it explodes. After a brief moment of relief, Conroy decides to arrest Paul. John refuses to cooperate and opens the door to the lab, revealing a large crowd, including Jenny and the press. The film ends with Paul freely departing the scene.