Patricia Scanlan, Mirror Mirror

I first read Patricia Scanlan's Promises Promises when I was 20 and most others I wanted to read the sequel, Mirror Mirror. About a month later I found it in my Grandmothers house and I was delighted with the outcome. The characters had all come more to terms with there lives and I found them more bearable and much stronger. My only disappointment was that at the end I found there was still more left hanging. Will there be another sequel?