The future casts a deadly shadow!

Twenty years of silence are over, and Lilo, Axel, Poppi, and Dominik are reunited again. After their experiences on Canon Island they agree to meet in New York City. It’s supposed to be an unforgettable time.

But one day before the planned reunion, everything changes for the four suddenly:
A door is torn open and Dominik is presented with the chance of a lifetime.
Somewhere near Graz, Poppi opens a door and sees her worst nightmare behind it.
In Vienna, a door is unlocked and a cruel act of revenge against the four takes its course.
In San Diego, a door opens and their old adversary Hermes pursues a terrifying plan.

The Knickerbocker Gang fights for their careers, their lives—and for love!