The Strangers in 7A plot
"Held hostage in a building where a bomb is set to go off. But where... and when?"
A man, who has just been fired from a factory, lives with his wife in an apartment complex and works as a janitor. When his wife leaves town to visit a sick relative, he is seduced by a young blond woman who wants to spend the night with him. He leaves her in apartment 7a, because those tenants are temporarily gone. Then her friends appear on the scene, because they want to use the apartment as a base for a robbery at the bank next to the complex.