Deadly Donuts — Jessica Beck

When a mysterious stranger shows up at Donut Hearts threatening to reveal a deadly secret about Suzanne's late father, she believes that he's lying, but when he offers to show her proof that her dad wasn't who she thought he was, Suzanne realizes that she has to listen. It's just too bad that the stranger is murdered before he can share what he knows. Suzanne and her mother are the main suspects, but it turns out that there are plenty of other people who wouldn't mind seeing the stranger dead!