The Sympathizer by Viet Thanh Nguyen (2015) Grove Press (Pulitzer Prize 2016)

There is no honor among thieves or revolutionaries.  The main character, a captain, a spy for the Viet Cong, is airlifted from Saigon along with the General and his family who provided a home in Saigon and a career.  Having been educated in the U.S., he is considered an invaluable aide to the General.  He even consults on a movie about the war and returns to the U.S. again, as a hero for the lost cause.  At least until it is suspected that the captain has designs on the General’s daughter.  Then he is expected to go back to Viet Nam and die, trying to fight against the communists (his allies).  But things do not work as anyone expects.