Light in the Dark are the synopsis books compiled after the construction of the main books, and it could be used for a quick glance at the topics covered without having to struggle through the entire book series. There was also a few details added that might have been missing from the main books. Perhaps not surprisingly, Part I (Eyes Wide Open) covers half the territory, leaving the other half for Part II (Change), so Book I is a book of status and Book II is a book of forward movement.