Good overall look at the Angevin dynasty. My only point of contention against it, i.e. my reason in giving it 4 stars, is Barratt's obsessive vendetta against St. Thomas à Becket. I can understand not calling him St. Thomas as most of the discussion is about him while he's living, but the author legitimately takes every negative rumor about him from the decidedly biased King Henry II at face value, it's absurd. Barratt even recognizes this, but refuses to relent, calling him vain etc. for daring to wear the robes of his office as chancellor. Really now.
Barratt comes off as a typical secular liberal (his great uncle was a mole for Stalin in Whitehall after all, according to the dust jacket) who not only can't fathom someone being of a genuinely religious nature (they suspect every religious person is a hypocrite), but also eternally frustrated that centralizing tyrant kings aren't 21st century liberals in their politics. That being said, aside from his bizarre distaste for St. Thomas à Becket, he's even-handed everywhere else.
Also, please ignore the other reviewers that are confused why Barratt would talk "so much" about the exchequer and financial issues. He honestly doesn't talk too much about them and I wish he had gone more in-depth for a Yankee as myself who's not familiar with the exchequer's role, but you do get a general idea for those not acquainted. However, for these reviewers to think that the freaking purse strings of an empire aren't important enough to mention - or even worse - that these dullards actually wanted details on titillating dalliances and personal court gossip in a HISTORY book over the real crucial bits of power in that period says more about them than it does Barratt, warts and all.
Another plus for Barratt is his recommended reading at the end, especially of the estimable Sir Charles Oman in addition to Gibbons and Mary Beard. Oman btw is firmly in the public sphere being a late Victorian/early Edwardian historian and you can find his works gratis on archive dot org.