Not all humans were given Guardian Angels, only those who were living a life that would leave a lasting impressions on the world. Gabriel, a direct descendant of the Ark Angel, was assigned to Cassandra Marks due to her line of work - helping orphanages worldwide.

Cassandra was only thirty when her world was turned upside down with one sentence - "I'm sorry, we've confirmed you have breast cancer." She was ready for the battle because she had so much more she wanted to do in the world.

Gabriel and Cassandra should never have met, but with her life in danger, he's sent to Earth in human form to judge her and see if she is worthy. While there, he finds himself falling in love with a woman who is destined to die. It's up to him to convince his fellow Angels she is to live, and up to her to decide if she can handle being the woman to make a Guardian Angel fall.