'Kasha and her father's new wife Jill, who Kasha and her mother call "That Woman", are exploring underground caves when a large rock falls and is about to seal the passage where Jill had gone ahead, unless Kasha holds it back. Will she resist the urge to get rid of "That Woman" for ever - and even if she wants to, how long can she hold on?'
Source: Bookseller's website