Riverrun

Young Theo Etchison is a truthsayer—one with the ability to navigate the great river that connects all the parallel universes. His mother, Mary, is dying of cancer, but she may also be the mother goddess, the nurturer of the world. His father, Phil, is a second-rate poet; his brother, Joshua, has been seduced by a dragon-succubus. On a journey through America to a Mexican alternative medicine clinic, the Etchison family is sucked into the world of the Darklings, superhuman creatures who are battling for domination of the cosmos, who need Theo's special gift..