Back story - Robert B. Parker

In 1974, a revolutionary group held up the Old Shawmut Bank in Boston's Audubon Circle. Money was stolen. A woman named Emily Gordon, a visitor in town cashing traveller's cheques, was shot and killed. No one saw who shot her. Despite CCTV photos and a letter from the group claiming responsibility, the perpetrators remain at large for nearly three decades. Then Paul Giacomin, the closest thing Spenser has to a son, brings Daryl to see him. She is the daughter of the long gone Emily and wants to finally know the truth about her mother's death .