"The Mist," like "A Quiet Place," is primarily a movie about the lengths parents are willing to go to for their children. And while "The Mist" doesn't involve an extraterrestrial invasion, it does involve scary creatures attacking people.
"The Mist" begins with a major storm that causes damage to the Drayton's home. The next day, father David (Thomas Jane) and son Billy (Nathan Gamble) go into town with their neighbor to get supplies. On their way to the grocery store, military convoys from a local base go in the opposite direction. Shortly after they arrive at the grocery store, sirens go off and a man runs into the grocery store yelling that there is something in the mist as we see a giant cloud quickly overtake the town.
From here the movie overwhelmingly takes place within the confines of the grocery store, but director Frank Darabont's dynamic camera choices make the single location visually dynamic. As the film unfolds, different people in the store have different ideas about what they need to do and how they can best survive the situation. Conflicts of course arise, but the greater threat is outside in the mist, as throughout the movie a variety of fantastical creatures descend on the store and the people inside.
Fans of "A Quiet Place" will find a thematic similarity here in the focus on the relationship between David and Billy, but will also find similar thrills as the people of the town fend off incredibly designed creatures.