In The Vanishing Stair, Stevie Bell reunites with her friends at Ellingham, he boyfriend and she break the awkwardness and their romance grows further, but she is still as anxious as she was earlier, still having to take medicines for anxiety when she needs. With the dark reality of one classmate who had died and one other classmate who went missing still looming in the air, she is still thinking about crime, like a determined detective would. Who is responsible for the Ellingham murders and who killed her classmate?