I have to give it five stars because I started right before I wanted to go to bed and ended up staying up all night(435 pages)because I just had to know if what I thought was going on between Clara and Christian was true. Why is it called a purpose? I am still confused on that. It was a bit of a cliffhanger for me I need more info! It was definitely a really unique angel story. 
 Clara is 1/4 angel-blood. She lives in California then has her first vision of her "purpose". Every angel has one and it comes at different times with different visions of what she has to do. She sees a boy in a fire and she is drawn to him and must save him. She moves to Wyoming to follow him and find out when she has to save him but while he is away in New York for the summer, she falls for her friends brother. Tucker is amazing, sweet, and accepts her angel-blood. She is in love until the fire from her dream erupts and she has to either save Tucker, the boy she now loves, or Christian her "purpose".