Kenzie and Gennaro is a series of crime novels written by author Dennis Lehane. The series features two main characters, Patrick Kenzie and Angela Gennaro, who are private investigators in Boston. They often find themselves entangled in complex cases that explore themes of morality and justice. The first book in the series, titled A Drink Before the War, was published in 1994. The duo's dynamic relationship and their gritty adventures have garnered a loyal following, leading to adaptations in other media, including film. The series is known for its realistic portrayal of urban life and its engaging storytelling.