Big Finish could make a series of this

... if you gave them half a chance.

146) Deeper - Megan Hart
Twenty years ago she had her whole life spread out before her.She was Isobel Watkins, a fresh-scrubbed, middle-class student ready to conquer the design world. And she was taken. Absolutely and completely. But not by Elizabeth, her well-groomed, intellectual girlfriend who had hinted more than once about a ring. No. During that summer she met Zoë Heriot, the moody, dark-haired, local bad girl. She was, to put it mildly, not someone she could take home to Daddy. Instead, Zoë became her dirty little secret — a fervent sexual accomplice who knew how to ignite an all-consuming obsession she had no idea she carried deep within her. Isobel had always wondered what happened to Zoë after that summer. And now, back at the beach house and taking a break from responsibility, from marriage, from life, she discovers her heartbreaking fate — and why she never came back for her. Suddenly Zoë's name is on her lips... her hands on her thighs... dark hair and eyes called back from the swirling gray of purgatory's depths.

(I also wonder if the generator's pick for romantic false lead was Liz Shaw or Elizabeth Bennet).