The Message of Blood - David Penny

Spain: 1489. Cordoba, Andalusia
When Thomas Berrington is sent to Cordoba on the orders of a man he hates he welcomes the distraction of a murder, but is shocked when the evidence points to the killer being his closest companion.
With Jorge is imprisoned, Thomas must continue his investigation alone - a task made harder by the distraction of two beautiful women.
In his search for the truth, Thomas twists and turns through the confusion of Jorge's past, uncovering a myriad of revelations. Each one throws up a new suspect.
Reunited they come close to discovering the identity of the culprit, only to confront an adversary more powerful than any they have faced before. To save Jorge's life, Thomas might have to sacrifice everything he has gained.