Note: if you haven't read the first three books please do so first.
This book starts off right where we left off. And with Ciel having some questions for Lucy and Sebastian.
Lucy now has control in traveling between worlds. She's stays in the black butler world without knowledge of what's to come.
What Consequences will follow?
In staying in this world she will meet many new people in her life there. She will also get to help with new cases.
Her new life will be full of new surprises. What awaits her in her new life?
Note2: if you haven't read the manga there will be spoilers. You've been warned.