This is a biography of King Stephen, gather from various sources and very well researched.
After Henry I's death, there was no clear successor. Stephen, his nephew, managed to convince, seemingly though charm and largess, the nobility that he was the man for the job.
Henry's daughter Matilda, married to a German emperor at the time, disagreed, and what followed was a long period of instability as the two factions sorted out their differences.
Matilda, never succeeded becoming queen of England, and Stephen never succeeded in cementing his line. Upon his death, Henry II, the son of Matilda, took the throne, and an important lesson was (sort of) learned - always make sure you secure your legacy before you die.
As with most, proper, historical accounts, this is quite dry, there are 1000s of references to keep even the most obsessive lay history buff happy, and King (e.g. Edmund, the author) keeps it as interesting as he can. It does get confusing at times as there are a lot of people called Henry, and a lot of people call Matilda to keep track of. These Normans it seems are not ones for original names.
Any case, I enjoyed the slog through this tome, and will probably feel the urge to check out another of the Yale History of English Monarchs series at some point.