"Love is both poison and cure, both knife and remedy."

Rosa's best friend, Catherine, is dead and she is sure Catherine’s betrothed, Marquis Guilleme is to blame. Mother says so. Mother says he has to pay with his life. Although, she knows by now Guilleme is no ordinary man. He is tainted. A monster. He cannot be killed by usual means. To seek the best revenge, she must find out all his secrets and destroy him. But will her own dark desires consume her or liberate her?

No matter.

Mother will tell her what to do.

[From official site]