What I thought was true

"17-year-old Gwen Castle is a working-class girl determined to escape her small island town, but when rich-kid Cass Somers, with whom she has a complicated romantic history, shows up, she's forced to reassess her feelings about her loving, complex family, her lifelong best friends, her wealthy employer, the place she lives, and the boy she can't admit she loves"--Provided by publisher.