Bowen, Rhys. Royal Spyness mysteries.

Thorndike Press large print core series.

With her hateful brother, Binky, in town, Lady Georgiana Rannoch is desperately seeking an escape, which comes in the form of an invitation from the queen to represent the royals at a wedding in Transylvania. The bride happens to be her old school chum, Marty. But staying in her macabre-looking castle proves to be unnerving - especially when she finds dear Marty with blood running down her chin, and a prominent wedding guest is poisoned