He promised, until death do us part.When bossy, loving, sensible Kate dies suddenly, her little sister Rose dutifully returns from a carefree life abroad to help Kate's widower and the two children Rose has never met. But she is unsettled to see no trace of her warm-hearted sister in the remote, dilapidated house, nor in Kate's cold, distant partner, Evan.After stumbling across a message that only her sister could have left for her, Rose's unease around the circumstances of Kate's death turns to open suspicion, but she knows better than to ask the grieving widower for answers.Determined to discover the truth of her sister's terrible last days, Rose has no choice but to keep looking. Eventually, she senses, the dark house will give up its secrets.But she is not prepared to admit that whoever threatened Kate's life might now be coming after her...