What is the solution to book slam?

There's no single solution to a "book slam" as the term isn't a standard literary or puzzle term. It likely refers to a specific context or game you haven't fully described.

To help me understand what you mean, please provide more information, such as:

* What is a "book slam"? Is this a type of game, a riddle, a challenge, or something else?

* Where did you encounter this term? Knowing the source will provide context.

* What are the rules or conditions involved? What are you trying to achieve or solve?

With more detail, I can attempt to give you a helpful answer.