Last of the Seals by Greg Messel

Mystery, romance and baseball in 1957 San Francisco. Sam Slater is a lifetime minor league baseball player for the San Francisco Seals. The Seals have just one more season left as San Francisco is about to become a major league city. Sam has come to the end of his baseball career and is going to join the private detective agency of his best friend. When Sam’s partner inadvertently sees something he shouldn’t have, he is brutally murdered.