Getting Caught in the Rain by Melinda Barron

Rachel receives unexpected visitors on New Year’s Day: police officers telling her that her former lover’s Aunt Agatha has passed away, and they can’t get in touch with him to tell him.
When Rachel tells Dexter about his loss, it brings them closer together. But as they plan Agatha’s funeral, they find out more about her than they thought possible.
They also find out more about themselves. Can they fulfill Agatha’s final wish, and get back together for the rest of their lives?