This book consists of an episode guide for the first three seasons of the Sopranos, plus several short essays.
For each episode, Bishop gives us a plot description, then briefly discusses several topics "Mobspeak" has new mob terms used in the episode; "Mama Mia" tracks Livia's activities. The topics conclude with "The Verdict"--Bishop's opinion of the episode as a whole.
While the book promises insight and to tell us about things we might not have seen, it doesn't fully deliver. I doubt if any of the "insights" would come as news to anyone of normal intelligence who has paid attention while watching the series.
Bishop, a Brit, tends to use Britspeak at odd moments--he refers to the young Tony hiding in the "boot" of his father's car, for example, rather than the American "trunk". Much more annoying are the errors he makes--he misspells "Paterson" as "Patterson", gives the first name of the imprisoned mob boss (never seen) as Ercoli--it is actually Dominic, or Dom (Ercoli is Tony's late, mentally disabled uncle), and misspells "caporegime" as "copa-regime", among many others.
A somewhat-useful reference guide, since it includes cast lists (but you can get those from the HBO web site as well). But don't expect too much beyond it. The cheapest of the many Sopranos books out this season, and perhaps also the least worthy.
Try another Sopranos book before you go here.