I'm looking for a book that talks about the history and process of italian unification starting from revolutionary france/napoleonic era and ends with the unification of italy.
I can point you to some of my favorite reads on the subject.
The Pursuit of Italy: A History of a Land, Its Regions, and Their Peoples by David Gilmour explores the development of Italian identity versus regionalist sentiments before, during, and after the Risorgimento with emphasis on Italian Unification.
Italian Unification, 1820-71 by Martin Collier is more condensed but covers exactly what you're looking for. Starting the with aftermath of the Congress of Vienna to the completion of Italian Unification with the capture of Rome. Sorry I can't seem to find a kindle or PDF version of his available online.