Murder has no class

the long version

... Headmistress Meredith Llewellyn's assistant is behaving badly, the maids are planning an all-out riot, and the lads from the darts championship are corrupting her girls. But these troubles are not what keep Meredith up at night. Rather it's one livid ghost ... Lord James Stalham has continued to claim his innocence in the murder of his father--even after they've hung him for it. Now Stalham's ghost, desperate to clear his name, is haunting Meredith. The practical headmistress needs her sleep, so she sets out to find the truth--and discovers a scandal that's far more complicated than upper-level mathematics ..."--Page 4 of cover.