Not Forgotten - George Lee Miller

"Loved it! Not Forgotten is tightly written, well-paced, and as hot as a San Antonio summer."
A boy in a Davy Crockett outfit discovers a dead woman in the San Antonio River. Her death is ruled accidental drowning. Two months later, the dead woman is forgotten by everyone but her mother. She's convinced it was murder and turns to former Marine and rookie private investigator Nick Fischer for justice.

Nick follows the trail to the grandson of one of the richest oilmen in Texas, a dirty cop, and a popular local attorney running for governor. Somewhere in the mix lies a secret they will kill to keep. Anyone else would quit, but Nick made a promise to keep going until justice is served.