A great book, has always been my choice. It is the only one I know of that correctly says the Chinese were in headlong retreat after their 1951 spring offensives were crushed and we counterattacked. He says that Truman then halted our advance when it reached the approximate 38th parallel to let them save face (this was confirmed in Margaret Truman's memoirs many years later). By Fehrenbach's account, it took them three days to realize we were no longer pursuing and come back to what became the DMZ.
In later research I learned that Russiawas extremely concerned that we had defeated the Chinese and would pursue them into China and reinstall the Nationalists. They let it be known that they would go to war over this, including atom bombing of Korea. Evidently Truman believed them.