Sunshine Enemies is a crime novel by the American writer K. C. Constantine set in 1980s Rocksburg, a fictional, blue-collar, Rust Belt town in Western Pennsylvania, modeled on the author's hometown of McKees Rocks, Pennsylvania, adjacent to Pittsburgh.

Mario Balzic is the protagonist, an atypical detective for the genre, a Serbo-Italian American cop, middle-aged, unpretentious, a family man who asks questions and uses more sense than force.

Next a brutal knife murder happens in the shop's parking lot.

All of this prompts Balzic the police chief to work the case, digging up reluctant witnesses and asking questions.

[1] It is the ninth book in the 17-volume Mario Balzic Detective Mystery Series.