Heresy - Number 8 in series

Catherine LeVendeur carefully constructed life of faith and family rests on the constant fear of a dreaded secret. Raised a devout Catholic, if her family's Jewish roots are exposed, everything she loves will be destroyed. But how far will she go to protect that secret? When her dearest friend, Astrolabe, son of the fabled theologian Peter Abelard, flees wrongful prosecution for the vicious murder of a young woman, Catherine's family offers him a hiding place.
But there are darker forces at work. Someone is using Astrolabe to destroy his father's fame and reputation - someone who would relish in the destruction of the very order of Christian life. With her family caught in the middle of such a dangerous conflict, the young Catherine must call on all her wits and courage to ensure the future of everyone she cares for.