What is the narrator point of view in the novel, The Widower’s Tale?

The author writes from the points of view of four characters in the story: Percy, Ira, Robert and Celestino. This allows for a more personalized perspective of the story. To make it even more interesting, the author writes Percy's chapters in first person narrative while the chapters written from the perspectives of Ira, Robert and Celestino are written in third person narrative.