Guardian angel Michael increasingly despairs over his time away from one of his Assigned, Alexandria. He is torn between his affections for Alexandria and his duty to the Heavenly army. Then one day Michael, thinking he has successfully hidden his feelings for Alexandria, becomes aware that Cainan, a fallen Guardian who was once one of Michael’s closest friends, has discovered his weakness. Cainan uses this information to try and draw Michael closer to the Underworld. Michael is given the choice to stay in the Heavenly realm or become a mortal. Michael then rediscovers what it is to be human.