Created from the angels, Guardians don't belong in Hell. But Cassandra Cosgrove is no ordinary Guardian, and she's determined to get into Hell despite the blood that runs through her veins. With a new resolve, and newly developed powers, she sets out on a journey into Hell to save a loved one from the tortuous hands of the King of the Underworld. But to get in, she must befriend a past enemy, and quickly learns that this is only the first sacrifice she must make to succeed. When Hell welcomes her with open arms, and a deal with the Devil seems the only way to save the men she loves from an eternity of torture, will Cassandra make the ultimate sacrifice by giving up her soul completely? Will the man she loves let her?

Saving souls for the Angels can wreak havoc on a girl's social life, but Cassandra Cosgrove has learned to manage. That is, until her visions suddenly become unpredictable and she finds herself surrounded by secrets. It turns out, a sparse social life is the least of her problems. Thrown into a world of danger, with her own soul on the line, Cassandra is forced to put her life in the hands of a dark, mysterious stranger who claims to be the only one that can save her. But how can she trust the man she's dreamt of for years, especially when those dreams centered around one important warning - he was there to kill her. In order to survive the evil that threatens to destroy her, Cassandra must learn who to trust, but more importantly, she must discover who she really is.