Now that you have created your concept map, there should be one or two aspects of your topic that seem both interesting and able to be turned into a workable question. Narrow your focus: you know what you're going for; now put it in the form of a question. Below I'm starting with a book you're not covering, Native Son by Richard Wright.
In the example to the left, I have added three limiters to my topic of Native Son.
Character: Bigger Thomas
Theme: Racism
Transformation: Behavior
These limiters help me narrow down my topic and gets me closer to a research question:
Native Son's Bigger Thomas Racism Behavior