Review characters, plot, and setting in In His Steps. Make notes. Write your review of characters, plot, and setting in the form of notes. Think about the strengths and weaknesses of each.
Search the novel for strengths in technique. Again make notes. Pay attention to strong or weak character development, strong or weak plot, how setting helps character development and action or overpowers them.
As a Christian, make notes on whether you can find a strong Christian interpretation. What is good and/or what is lacking?
Write your outline.