How is suspense created in Stepfather

There are many suspense scenes in the film Stepfather. These scenes were created by the bomb theory, false plateau and normality these are techniques used to create this suspense. At the start of the film there is a sense of normality. This is established by the killer acting normal by having a shower, shaving and putting the radio on which is playing silent night. He also made toast and coffee which makes us the viewers think everything is normal. This is then subverted by him dyeing his hair putting in contact lenses which is making us ask questions. We then see dead bodies laying around on the floor and we get the answers that he is a killer by him leaving them behind like that. Another suspenseful scene is created by false plateau. There is a scene when the door bell rings at the old ladies house and we think it is the killer however no one is there, after that a cat jumps out and again we think its the killer but third time the killer appears. The reason why this is so effective is because it happen three times and twice we thought it was the killer but the third is was, this is good because it keeps us thinking what going to happen next and keeps the intensity of the thrilling moment going. Bomb theory also create suspense in the this film the reason being is when the killer meets the women we the viewers know he is a killer but the women don't in this case the killer is the bomb.