Chapter 1 - Leads up to the inevitable lab accident we all know is coming; the back story and the like. Perhaps a secret experiment gone wrong or according to plan. The mystery is ever fully revealed until you purchase books 2 and three of the three book trilogy
Chapter 1.5 - Something escapes the lab, either by design or accident
Chapter 2-3 - People begin to die, panic ensues, and death spreads across the planet
Chapter 3.5 - The dead begin to arise. Well, Duh!
Chapter 4, 5 and 6 - People unaffected begin to find each other and band together. One hears about a possible cure, but they require a few chapters to find it. No cure; one member in the group is secret government plant or is after the buxom female hero
Chapter 7 - Many zombie battles and some people are eaten and they also arise. The bad guys within the group are slowly revealed. Or is he? We must wait for the next book
Chapter 8 - The band of fighters begin to look for the source of the cryptic TV or radio broadcast they are hearing. They keep seeing REDRUM on the walls so they follow the signs
Chapter 9 - More death, a few fights with unaffected bad and evil doers and the required love scene. Perhaps a love triangle
Chapter 10 - Minor resolution, but the writer leaves it open for the sequels to fulfill his or her contract with the publisher
Chapter 11 - The writer is attacked by zombies. Bet you did not see that one coming. No, wait . . . the reader is attacked by zombies. It is what you call a twist on a twist. No wait, they are at my door and one is inside with me, eating my foot. Got you again, your classic quadruple twist.
There you go . . I saved you all that time reading poorly written zombie books; that is to say, any zombie book.
They are all the same: Problem arises, ensuing action, lots of death, some quest to find salvation and the truth and sequels.