The author can tell the story from any point of view- his own or the characters'. He can even change the point of view inside a work and write each chapter from different character's viewpoints or he can write the entire work from a single point of view. When the author/narrator is not a character in the work, it is third person narration or Omniscient narration. When the narrator is a character in the story, then it is first person narration.
either first second or third person it depends on the pronouns
If the book uses "I" or "me" it's probably first person point of view. If they don't use "I" (or "you") it's third person.