Secret of the Shadows by Cathy MacPhail
Tyler is staying in her grandmother's cottage to help tidy it up after her death. Why does the spare bedroom that Tyler sleeps in always seem cold, despite bright sunshine? Why does she feel the presence of a frail old lady who is nothing like her grandmother? And why does she sense that the same old lady is asking for her help? Perhaps Tyler will need to use her gifts to help save somebody from a terrible fate . . .