Bad Scene by Max Tomlinson
Set in 1978 San Francisco, this mystery definitely isn't a cozy. The protagonist, Colleen Hayes, spent a decade in jail for fatally stabbing her husband in the neck with a screwdriver. Her estranged daughter is involved with a cult. (I'm guessing one of the earlier books in the series explained why there's a restraining order against her, filed by a different cult that her daughter was previously involved with -- these are really interesting characters!) She's also infiltrating a neo-Nazi group of bikers to investigate rumors that they plan to shoot the mayor. And did I mention the active volcano in South America where the cult is building its new church? This book is a wild ride that had me holding my breath more than once.