The Spengler family returns to where it all started – the iconic New York City firehouse – to team up with the original Ghostbusters, who've developed a top-secret research lab to take busting ghosts to the next level. But when the discovery of an ancient artifact unleashes an evil force, Ghostbusters new and old must join forces to protect their home and save the world from a second Ice Age.

When American military analyst, Daniel Ellsberg, realizes to his disgust the depths of the US government's deceptions about the futility of the Vietnam War, he takes action by copying top-secret documents that would become the Pentagon Papers. Later, Washington Post owner, Kay Graham, is still adjusting to taking over her late husband's business when editor Ben Bradlee discovers the New York Times has scooped them with an explosive expose on those papers. Determined to compete, Post reporters find Ellsberg himself and a complete copy of those papers. However, the Post's plans to publish their findings are put in jeopardy with a Federal restraining order that could get them all indicted for Contempt. Now, Kay Graham must decide whether to back down for the safety of her paper or publish and fight for the Freedom of the Press. In doing so, Graham and her staff join a fight that would have America's democratic ideals in the balance.