Yvette's Death — Gillian Larkin

Cara Daniels has a secret job. She saves the lives of people who are going to be murdered. She also saves the souls of the people who are due to commit the murder.
In book 3, the murder victim is Yvette Carter who is 42 and works at a wool shop. With the help of her angel, Cara is soon involved in Yvette's life. And it's not long before Cara meets someone who has plenty to gain from Yvette's death.