T is for Trespass by Sue Grafton

Solana Rojas is only her newest alias, but she has reeked havoc in numerous senior citizen's lives. When Solana is hired as a caregiver for a neighbor of private detective Kinsey Millhone, the reader knows no good can come of it. Kinsey has checked out Solana's background, but because she's using a former co-worker's identity, everything checks out clean. The bulk of this mystery involves Kinsey's attempts to stop Solana's abuse of Gus, Kinsey's neighbor. Kinsey is also working on finding a witness to an accident and a few other small cases that usually make up the majority of the business for her detective practice. Fans of Grafton's long-running mystery series will enjoy the latest book.