Year of the reaper
(Book)

Before an ambush by enemy soldiers, Lord Cassia was an engineer's apprentice on a mission entrusted by the king. But when plague sweeps over the land, leaving countless dead and devastating the kingdom, even Cas's title cannot save him from a rotting prison cell and a merciless sickness. Three years later, Cas wants only to return to his home in the mountains and forget past horrors. But home is not what he remembers. His castle has become a refuge for the royal court. And they have brought their enemies with them. When an assassin targets those closest to the queen, Cas is drawn into a search for a killer - one that leads him to form an unexpected bond with a brilliant young historian named Lena. Cas and Lena soon realize that who is behind the attacks is far less important than why. They must look to the past, following the trail of a terrible secret - one that could threaten the kingdom's newfound peace and plunge it back into war. --from book jacket