High Quality Content by WIKIPEDIA articles! Sweet Tooth is a novel by the English writer Ian McEwan, published on 21 August 2012. It deals with the experiences of its protagonist, Serena Frome, during the early 1970s. After graduating from Cambridge she is recruited by MI5, and becomes involved in a covert program to combat Communism by infiltrating the intellectual world. When she becomes romantically involved with her mark, complications ensue.