This is virtually a Trollope encyclopaedia, written in dictionary format; there are entries for all the leading Trollope fictional characters (who are many) and for leading personalities in his life or era, such as Gladstone. All the novels have separate entries too, and Irish readers there is much information about the novelist's stay in Ireland (as a postal official) and of his use of Irish material.
Incidentally, the original of Phineas Finn has been much debated and is often attributed to one of the Pope Hennessy family, but he appears to be a composite character, as many of us have thought. For those who still think of Trollope as the chronicler of provincial rectories, it may be a jolt to realise how wide his interests and range were, and what insight he had into so many aspects of his time.