Through the Heart by Kate Morgenroth

Nora works at a cafe in a small Kansas town, caring for her leukemia-stricken mother. Timothy manages his family's wealth and lives in New York. By chance they meet and fall in love, which leads to someone's murder. Whose, though? The reader isn't sure, but through Nora and Timothy's eyes we see the development of their relationship, their feelings for one another, and the unhappiness their prospective family ties bring to their lives. With so many unpleasant people, the book abounds with victims and suspects. Finally, near the end, the crime is revealed. The hook of Through the Heart is definitely finding out who was killed, since most of the characters aren't likable.