[@CollectorOfMyst] I think Vivica was wondering how Indira knew about the existence of this book and how she knew that Viveca would be able to find the book in the catacombs, which is a mystery in itself.

Also, one thing that [@Scout] didn't mention, the book is a diary of sorts belonging to the boy in the sarcophagus. 

As for the transmission, I'll be PMing the actual content of it to you and [@OppositionJ] at the start of Chapter 1, which we're almost getting to!

EDIT: Oops! Misread your post, Myst! Yeah, you're right. Indira knows about the circle because she, along with any other inquisitors who have Omestrian blood flowing through them, all glimpse it in their Culmination visions.