Second Ring of Power by Carlos Castaneda

 The fifth book in the series starts with Castaneda going back to Mexico to talk to his friend, the apprentice of Don Genaro, but when he arrives at his house, the mother, Dona Soledad, attacks him and tells him that Don Juan told her to kill him and take his luminosity.  Castaneda, shocked, defends himself properly.  Then the three girls and La Gorda ("Fatty") who Castaneda thought were daughters of Dona Soledad, also try to trick him and attack him, trying to take his luminosity for themselves, but, at a crucial moment, Castaneda's double comes out of his body and almost kills the girls.

Then Castaneda discovers that Dona Soledad and the girls were actually apprentices of Don Juan as well and that he doesn't remember much of the time he spent with them and Don Juan.  Eventually he goes with La Gorda to various secret places that Don Juan told La Gorda in order to become the Nagual of the new group or "warrior party".  Towards the end of the book he and La Gorda start remembering that they spent time and trained with Don Juan's warrior party, but they were in the Second Attention (First Attention is of the physical body and the physical world) and they cannot remember it, or have very difficult time remembering exactly what happened, who they met and what they did.

This book is more exciting than the others, as it doesn't simply narrate the events as they happen, but it has the quality of a thriller with so many unknowns that one cannot help but simply keep turning the pages, which about with new characters and personalities, never before mentioned in the previous books.  It also makes a definite break with the non-fiction pretense of the previous books and dives deep into what most people would call pure fiction, but it is a good fiction, so there.