Murder And Rubber Chicken

While attending a social function at the local library, Sam Cates's uncle keels over. Autopsy results confirm he was poisoned.
After looking into the man's past for enemies, Sam receives a note that changes the direction of the investigation. But what connects the murder to the girl who served the dead uncle's table?
Sam has to use all her deductive skills to find out the identity of the murderer. And then, she has to figure out how to prove it.