Always read the fine print when swearing an eternal oath to gods and guardians... Beholden by the sacred vows of her coven, fire witch Calista Reid agrees to temporarily mate with shifter Cullen McMahan to fulfill a mission assigned by the guardians. When Tall, Dark and Damaged arrives on her doorstep, generating enough heat to scorch a fire witch, Calista finds herself drawn to his battle-hardened body and broken soul. His pain speaks to her own deep-rooted isolation and the intensity of his hunger slakes her passion like no other. Cullen, scarred by a past that left him an indentured soldier to the guardians, resents yet another hump-on-command assignment...until he encounters the compassionate, fearless, incendiary redhead who detonates his body and reawakens the emotions sacrifice and loss had suppressed. But Cullen harbors a terrible secret--one that reaches back into Calista's troubled childhood and threatens the foundation of their growing bond.