In 1878, war breaks out across Europe, pitting necromancers and those they control against the rest of Europe's coalition force of magical and non-magical beings. Mason, who has a gift for healing, and a taste for adventure, volunteers as a medic only to find herself a victim facing the choice between death, and unlife as a vampire.

She quickly adjusts with the help of her mentor, and eventual lover, Ian. A century later, Mason is on her own, navigating the world on her own terms until Dorothea, a girl with a hidden talents, shows up at her coven house.

With no one else to turn to, she seeks out Ian for help, discovering his new partner, fellow vampire and botanist, Jason. The trio navigate relationships both old and new, while they search for a means to help Dorothea, ultimately leading to a collision course with a vampire-mage faction determined to leverage The Envoy, the one dhampir that mediates for all vampire kind, for their own purposes.

With so many lives in the balance, Mason risks her own undead existence and discovers a truth that could ultimately change the fate of vampire-kind. .