Let’s look at how this breaks down into the story building blocks.
The premise and overall story problem is KGB agents living in suburban DC in 1981.
Secrets a character is willing to die or kill for are always powerful. The premise raises good story questions. Will their cover get blown? Will they be executed or returned? Will they defect or turn double agents? If they defect and go into witness protection, will their marriage survive? What would the children do if they found out their parents were Soviet agents?
Once you get a feel for what worked, you can apply it when planning your next novel.