A missing child sets four families on a frantic hunt for answers as they unearth a mind-bending mystery that spans three generations.

Six months after the disappearances of Mikkel, Jonas and Ulrich, Winden's web of mysteries deepens and the fate of the world hangs in the balance.

The time-twisting madness reaches its conclusion in a strange new world, where some things are quite familiar — and others are disturbingly not.