Plunkett Lake Press has reissued “Special Envoy to Churchill and Stalin, 1941-46,” an account of W. Averell Harriman’s years as President Roosevelt’s personal envoy to Britain at the outset of World War II, and as the ambassador to the Soviet Union from 1943 to 1946. Co-written with journalist Elie Able, “Special Envoy to Churchill and Stalin” is not strictly a memoir. Rather, Able transforms Harriman’s private papers, reports, and personal recollections into a compelling narrative about his efforts to conduct international diplomacy during WWII, and his role as an unlikely intermediary between the Big Three (Roosevelt, Churchill, and Stalin).