Discussions of the infamous Cambridge Five spy ring have usually centered on Kim Philby, Guy Burgess, and Anthony Blunt, yet the full extent of Donald Maclean's betrayal has never been explored. Roland Philipps unravels the character and contradictions of this agent codenamed "Orphan," creating a portrait of a communist who became a model English diplomat, a foe of the United States who nonetheless married an American. Maclean transmitted valuable intelligence to his Soviet handlers on the atom bomb and later defected to the Soviet Union, but as Philipps also notes, the Englishman remained unrepentant.