“City of Dreams” is the middle book in a planned trilogy that began when a stunning woman emerged from the surf at a Rhode Island beach in last year’s “City on Fire” and sparked a war between the state’s Irish and Italian crime families. Now, as the latest installment opens, Danny Ryan leads what’s left of the defeated Irish mob on an epic, cross-country journey in search of a new home and a measure of safety from the Italian gangsters, the Rhode Island State Police, FBI agents and a growing num