It's Elementary - Elise Bryant - Bog

"Mavis Miller is not a PTA mom, ... so no one is more surprised than Mavis when she caves to Trisha Holbrook, the long-reigning, slightly terrifying PTA president, and finds herself in charge of the school's brand new DEI committee.... Things go off the rails at the very first meeting, when the new principal informs everyone that he will not move forward with the plan to make Knoll Elementary the site of the district's gifted school. Mavis is relieved, but Trisha is absolutely furious. Later that night, when Mavis spies Trisha in yellow rubber gloves and booties, lugging cleaning supplies and giant black trash bags to her waiting minivan, it's only natural that her mind jumps to somewhere it surely wouldn't in the light of day. Except--in the light of day, Principal Smith fails to show up for work, and has been MIA since the meeting"--