Based on Stephen King's novel, The Mist is movie of king's typical twist. Followed by a overnight storm, strange mist prevail over country side. David along with his son and neighbour Brent went to a supermarket near their country side to get hold of some house hold stuff. However things got ugly their and it came out a strange creature monstrous type is in the mist killing people. While Mrs Carmondy think it is a wrath from God, sign of end of days, however it also revealed a secret military experiment has gone haywire.
As typical the end of movie is climax, when David think he has left with no choice, not to spoil others fun, I am not disclosing it. Have fun.