Tell-Tale Heart and The Black Cat- Comparison

Question #1. How does each author use ambiguity or uncertainty to add interest and to advance his themes? Cite an example of ambiguity in each story and describe its effect. Support your responses with evidence from the text. 

Question #2. Compare and contrast the social context of the characters in both stories. How do their interactions with others contribute to the themes of the two works? Support your responses with evidence from the text.