Of deeds most valiant : a poisoned saints novel

"Eleven paladins walk into a monastery. Only one knows it's a trap. When Victoriana Greenmantle is summoned to represent her paladin order in an unusual quest, the timing couldn't be worse. Having just witnessed the horrific death of her mentor, she is barely a paladin at all. Worse, she has a trapped demon on her hands and if anyone discovers she hasn't quite managed to cast it out, she will be made to suffer consequences worse than death. The s...