Isidor is a Templar - pledged to an Order of armed enforcers who keep a vigil over the purity and adherence to religious edicts that their ruling class must follow - as well as an Inquisitor in training, elite Templar who execute the Church's orders that are best left in the shadows. Concealing the secrets of the upper-class, spying, and hunting the Church's enemies are all in a day's work.

"The Heart Thief" is one such enemy: an infamous antiquities thief who is suspected of stealing one of the Church's most holy artifacts. Isidor is dedicated to tracing the clues left by them and bringing them to justice as a means to prove himself. But unearthing the truth behind the crime - and the criminal themself - may bring more to light about the nature of the Templar Organization than Isidor is prepared to learn.

When new knowledge challenges conventional wisdom, doubt and introspection challenge doctrine, and a young man so accustomed to following his heart feels it lead him towards a future that is contradictory to who he believes himself to be... where will his journey of faith, love, and the search for truth take him?