Seeker Of Fate: Fate Series #2 - L. J. Kentowski - Bog

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?