Looking for yesterday / Marcia Muller.

Bestseller Muller's strong 31st Sharon McCone mystery centers on Caro Warrick, who was tried three years earlier for murdering her best friend, Amelia Bettencourt, a member of a prominent San Francisco political family. Caro is seeking McCone's help in establishing the truth of Bettencourt's murder. Warrick allegedly shot the other woman 12 times in Bettencourt's Nob Hill apartment after learning that her friend was having an affair with her lover, up-and-coming stockbroker Jake Green. Green's suspicions insured her indictment Although Warrick was acquitted at trial, popular sentiment still regards her as guilty. Her efforts to rehabilitate her reputation have led Warrick to partner with a true crime writer, but a vindictive journalist, who has a vendetta against Warrick in part because of her support for gun control, is also planning a book and is trying to block hers. Unexpected plot turns complement a plausible, relatable lead character.