For fourteen years, following her parent's death, 20-year-old Aries was forced to train under the watch of her captors, the Seven Sister Sins. Their cruelty, paired with the emperor's demands, keeps her in a constant state of survival, except when she is with Cage, the dragon prince. After years of obtaining the marks of the shapeshifters within Arcanum, she has a chance to escape from the ruthless emperor and the Sister Sins-choosing freedom over love.

Or so she thought.

Cage sends his two best men, covert hybrid twins, in a desperate attempt to get Aries back. When captured, Aries and one of the hybrids are viciously poisoned, marking them both for Hell unless they find a cure. Unsteady alliances are formed as Aries fights for her life, discovers the truths of Arcanum's history, and learns who she really is.