Astronaut John Glenn has his sights set on a political career and hits the campaign trail with wife Annie and Rene Carpenter by his side as he runs for the Ohio senate, while Alan Shepherd quietly grapples with a personal matter that could ground his career forever. Meanwhile, Betty Grissom receives an unsettling letter regarding Gus that challenges their marriage.

Betty Grissom faces the grim reality that her husband, Gus, is gone. With Gus having died while preparing for a NASA mission, Betty must move forward planning his funeral and a life without him. After receiving word that Gus' death may have been preventable, Betty is determined to get answers in Gus' death and embarks on a battle for justice.