What is the author's style in Reliquary by Douglas Preston?

The book is written from the perspective of several characters at different times. For example, Bill Smithback serves as the perspective when he is in the tunnels with Duffy, Waxie, and the other officers. The reader continues to see the action through Smithback's perspective until he encounters Margo's group, also in the tunnels. At that point, the perspective changes to that of Margo, though Smithback remains a part of the coming events. The changing of character perspective may be distracting to some readers but is overall an effective way of presenting the information.