If You're Dying to Know What Happens at the End of 10 Cloverfield Lane, Here You Go

It all basically happens in one pivotal scene. Michelle and Emmett have come to the conclusion that Howard is a psychopath. They form an escape plan, but Howard's onto them. He confronts them over a barrel of actual acid and asks them to admit what they've been up to. Emmett takes the blame, making up a shoddy excuse about winning Michelle's respect. Howard shoots him in the face.