From the Publisher's Website:
Grand Guignol is a game of redemption and damnation inspired by the work of Alice Cooper.
Action resolution is performed by rolling two (six-sided) dice. If the total is equal to or under the attribute value, the action succeeds. 2 is always a success; 12 is always a failure.
Characters have seven primary attributes based on the Seven Deadly Sins, and two secondary attributes: Conscience and Madness. During play, characters can receive ranks in further attributes based on the Seven Virtues.