Book Confusion

I am usually reading at least one book and listening to another audiobook. When they are different, I can keep them straight. But sometimes they are so familiar that the plots get intertwined and I get confused. For example, I am reading one book where a troubled teen with a single parent heads off to another world to help save that world. And I'm listening to a book about a troubled teen with a single parent who heads off to space to help save the world.