The Lava in My Bones tells the story of a bizarre and dysfunctional family undone by their deeply religious roots. When a gay geologist becomes obsessed with eating rocks and his teenage sister begins oozing honey from her pores, their fanatical Pentecostal mother cannot cope and calls upon the Holy Spirit over and over again in an attempt to drive out her children's `demons'. In hopes of starting a new and better life, the siblings board a ship bound for Europe. Little do they know their mother is also there with a plot to win back their souls.