When twelve-year-old Flick Hudson accidentally ends up in the Strangeworlds Travel Agency, she uncovers a fantastic secret: there are hundreds of other worlds just steps away from hers. All you have to do to visit them is just jump into the right suitcase. Then Flick gets the invitation of a lifetime: join Strangeworlds's magical travel society and explore other worlds.

But, unbeknownst to Flick, the world at the very center of it all, a city called Five Lights, is in danger. Buildings and even streets are mysteriously disappearing. And when Flick realizes what's going on, she must race against time, travelling through unchartered worlds, to find a way to fix Five Lights before it collapses into nothingness--and takes her world with it.