What is the narrator point of view in the novel, The House Girl?

The story is written in third person from limited perspectives that vary, specifically depending on the time frame. The earlier story line focuses on Josephine Bell, a slave girl who lives in the mid-1800s in Virginia. In that story line, the reader sees everything from Josephine's perspective. The storyline that is set in modern times is presented from the perspective of Lina Sparrow, a young attorney doing research for a class action law suit. The changing perspectives are necessary for the reader to follow the story because of the years' difference in the settings.