"The Devil in a Blue Dress" is a mystery novel written by Walter Mosley, published in 1990. The story is set in post-World War II Los Angeles and follows the protagonist, Easy Rawlins, an African American World War II veteran who becomes a private investigator. He is hired to find a missing woman named Daphne Monet, who is known for her striking blue dress. As Easy delves deeper into the investigation, he encounters various challenges, including racial tensions and dangerous criminals. The novel explores themes of identity, race, and the complexities of urban life, making it a significant work in the genre of African American literature.