House of Many Shadows — Barbara Michaels

She was trying to solve a murder that was two hundred and fifty years old...

When Meg's wealthy cousin Sylvia lent her the old house in Pennsylvania, Meg did not dream she would be drawn into a strange girl's distant past and into the brutal murder of three innocent people.

Meg saw them clearly. The old man, the servant, and the girl. She knew what horror lay in wait for them. But could she reach them across the years? Was it even safe for her to try?