George Higgins wrote books in which the entirety of the plot seemed to take place through dialog. Cogan's Trade is another example. All dialog all the time. Great walls of it on each page. This works for Higgins as for few others. Higgins was, along with Elmore Leonard, one of the greats at writing crisp, streetwise dialog.
When this works, it really works well (see The Friends of Eddie Coyle) In Cogan's trade it works, but not as well. I liked the book well enough but not as much as Eddie Coyle.