Eddie Whatever by Lois Ruby

Pre-Loved Hardcover Thirteen-year-old Eddie needs to do a community service project in preparation for his bar mitzvah. Against his better judgment, he ends up with a volunteering gig at Silver Brook Pavilion retirement home, where the residents call him "Eddie Whatever" rather than worry about remembering his last name. These old folks soon upend all Eddie's assumptions about the boringness of the elderly. There's a dramatic courtship unfolding, long-hidden secret identities, a rumor of a vengeful ghost, and a thief on the loose. When suspicion falls on Eddie, he teams up with his fellow volunteer (and crush), Tessa, to solve the mysteries of Silver Brook.