RSVP is a sumptuous family saga, packed with sex, love and betrayal.

The Granville Midsummer Ball is always an affair to remember. The who's who of Irish society gather at Carrickcross House - the rural family estate - for a night of revelry. But this year's soiree is extra-special: matriarch Honoria is announcing her grandson Rossa's engagement to Ashling Morrison.

Ashling has been swept off her feet. Tall, dark and handsome, Rossa's the perfect catch, but is he too good to be true?

Why is Honoria so keen to make Ashling - stepdaughter of her life-long enemy Coppelia - part of the Granville clan?

Can Rossa's brother Carrick hold on to his position as rightful heir?

And will ruthless Coppelia have her way?

With the promise of distinguished company, drinking, dancing and murder...who could possibly refuse this invitation? Repondez s'il vous plait.