What is the author's style in After the First Death by Robert Cormier?

The novel is seen from many points of view. The novel begins in the first person point of view. This narrator appears to be Ben Marchand, the son of Brigadier General Marcus Marchand. As the novel continues, it moves into the third person omniscient point of view of Miro, one of the hijackers of the bus. This melts into the third person point of view of Kate Forrester, the bus driver, Raymond, one of the children, and Monique, another child on the bus. Finally, the reader is introduced to the general himself when he takes over his son's first person point of view narration. This narration eventually reveals that he is an unreliable narrator because it has always been his first person point of view, never Ben's.