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.