D is for Deadbeat

Book 4 in the Kinsey Millhone Alphabet series from the New York Times bestselling author, Sue Grafton.
"My name is Kinsey Millhone. I'm a private investigator... Female, single and self-employed, with a constitutional inability to work for anyone else. I'm a purist when it comes to justice, but I'll lie at the drop of a hat. Inconsistency has never troubled me..."
It was late October, the day before Halloween. He introduced himself as Alvin Limardo. The job he hired Kinsey to do seemed easy enough... until his cheque bounced. His real name was Dagett. John Dagett. Ex-con. Inveterate liar. Chronic drunk. And dead.
The cops called it an accident - death by drowning. Kinsey wasn't so sure. The man, it seemed, had a lot of enemies...