High above the city, a young guardian searches for the enemy...and finds love. In a city rife with evil, masked protectors secretly watch over the inhabitants, keeping the citizens safe while hiding their own identity. One young Sentinel, however, violates her oath and loses her heart to the woman she is charged to protect. By day, Pagan Osborne is a shy security specialist working in the family business. By night, as a Sentinel, she fulfills a greater family legacy and battles the criminals who threaten Chastilian's peace. Erith Baylor, a fiery young woman with her own secrets to hide, is drawn to Pagan's quiet charm and silent strength. But with so many secrets between them, their attraction could break the ties of family and finally reveal the truth behind the mask.