Little Sisters by Barbara Gowdy

Rose and her mother, Fiona, run a small rep cinema barely making ends meet. Rose is haunted by the ghost of her dead sister Ava – feeling responsible for her death. She begins to have out of body experiences inhabiting the body of another woman every time it thunders and rains. I know it sounds strange (well it is strange) but the story is fast paced and wonderfully written with endearing, funny characters that keep you guessing to the end.