Sophie Foster's epic journey continues in the sixth book of the Keeper of the Lost Cities series, Nightfall. Sophie Foster is living through trouble. The Neverseen is still on the run, with Sophie's family with them. The Black Swan has had some interesting surprises, and all Sophie can find are the wrong clues. Then, one clue reveals where the Neverseen might be hiding: Nightfall. Sophie and her friends struggle through hard times, fear, and sadness. Nightfall was a great book because it allowed me to understand that even though you have all kinds of problems, family always stands out the most. That works not only for Sophie, but for Keefe, Tam, and Linh. Nightfall, along with all the other ones, was a great part of the Keeper of the Lost Cities series.