The Judas Kiss — Victoria Holt

The splendor and pomp of the Bavarian kingdom had seemed like a fairy tale to the recently arrived young Englishwoman. Pippa Ewell had left behind dark and forbidding Greystone Manor, and the memories of Conrad, the handsome stranger who had swept her breathlessly into his arms and heart.

But Pippa had come to find the truth behind her sister's mysterious death. And suddenly the fairy tale kingdom glittered with evil and danger. It seemed that not even her rekindled romance could save Pippa from the fate that had cruelly claimed her adored sister....

Hero: Conrad
Heroine: Phillipa (Pippa) Ewell