What is the theme in The Beekeeper's Apprentice, or, on the Segregation of the Queen by Laurie R. King?

Duality of personality is the main theme of the book. Many of us have two distinct personalities. One is the person that we show the world and is the personality that we would like to be, and the other is the person that we are privately—the more honest self. Holmes is also two distinct and separate personalities. One is the detective. It is the part of him that most people see. He is dedicated, observant, often abrupt and determined. He has multiple abilities, including the skills of assimilating information and reading people. He also is a master of disguise, enabling him to blend with a multitude of surroundings with little preparation. Called upon by private and public sector alike to aid with a variety of confusing and often disturbing cases, he is invaluable and irreplaceable.