Sleeping crime - Agatha Christie

Strange things began to happen to Gwenda shortly after she moved into her new home.

Gwenda's anxiety began to grow when she saw herself returning to the past again and again, and her anxiety was increased by the vague terror she felt whenever she was about to descend the stairs to the ground floor.

Gwenda puts her fears into Miss Marple's hands, chief among them is a strange mystery: faint memories of a murder committed in the distant past.