Riverrun

As a family travels to a cancer clinic in Mexico, son Theo has been having strange dreams. And, as they're passing through Arizona, "the walls between worlds dissolve and Theo is kidnapped by the vampire prince Thorn".

In the sequel to Riverrun, young Theo Etchison is drawn into Strang's terrifying dimension and begins a bizarre odyssey across an inverted land.

Follow the exploits of the Etchison family as their mortal world is rehaped by warring dragon-children under the control of the Darkling King Strang. Within Theo Etchison lies the power of a Turthsayer, a power the Darklings need to dominate the universe.