What happens in chapters 11-15 of sign the beaver?

You're asking about the events in chapters 11-15 of "Sign of the Beaver," but you haven't provided any context.

To answer your question properly, please tell me:

* Which book are you referring to? There are multiple books with similar titles, including the series by Elizabeth George Speare.

* What is the main plot of the story? This will help me understand where we are in the narrative.

Once you provide this information, I can give you a detailed summary of the events in chapters 11-15.