Probate attorney Mara Cole is named the seventh heir to Grange Manor and must live there seven days to inherit. The previous six heirs all vanished. At midnight a hidden game begins, and Mara follows clues through journals, a garden maze, and a family crypt, freeing Arthur Grange, the last living Granger, sealed away by his late brother Alistair. She learns a two-hundred-year-old contract sacrifices each generation's heirs, and that the killer is her own mentor and the estate's executor, Malcolm Vane. Exploiting a loophole that makes the seventh heir a Grange by right, Mara voids the contract at midnight, burning it and freeing the trapped souls. Discovering she is Alistair's lost granddaughter, she stays on as the manor's guardian.
