Penguin book by Truman Capote (2005) - Summer Crossing.

Flame-haired Grady McNeil is beautiful, rich and defiant. Her privileged society life leaves her wanting, and excitement comes in the form of the highly unsuitable Clyde, a Brooklyn-born, Jewish parking attendant. When Grady's mother and father leave her alone one summer in their New York penthouse, her secret affair intensifies and she is forced to make decisions that will alter her future indelibly. Truman Capote's recently discovered debut novel is a captivating portrayal of first love.

 Pick up available in Ballarat. I will combine on postage to save on costs.