"Behind Closed Doors: Secrets of Great Management" is a book that discusses the strategies, techniques, and approaches that successful managers use to lead and motivate their teams. It is likely that the book covers topics such as how to effectively communicate with and delegate tasks to team members, how to create a positive and productive work environment, and how to handle challenges and conflicts that may arise within the team.

Some other themes that might be covered in the book include:

• The importance of setting clear goals and expectations for team members
• Techniques for building trust and fostering collaboration within the team
• Strategies for developing and nurturing leadership skills in team members
• Tips for creating a positive company culture that supports growth and innovation
• Approaches for managing change and adapting to new challenges and opportunities
• Ways to measure and evaluate team performance, and ways to provide feedback and support for improvement.

It's also possible that the book includes insights and examples from successful managers and leaders in various industries, as well as practical tools and resources for managers looking to improve their leadership skills.