The Curse of the Clodaghs — Frances Cowen

As the new visitors' guide, Tess Connolly is a lovely addition to historic Clodagh House. Neither Richard, the new Lord Clodagh, nor the other members of the household, however, are aware that Tess is really the key element in a dangerous scheme concocted by her fiancé, Shaun Clodagh, to expose his brother's murderer…

When it appears that Shaun, too, is dead, Tess is torn between the knowledge that this is part of the plan, and a horrible suspicion that he has unwittingly become the victim of his own ruse.

Alone on a mission that has lost its meaning, in a house full of people she doesn't trust… Tess stands in the way of a murderer bent on total victory