I heartily recommend "Divine Invasions" by Sutin (https://www.goodreads.com/book/show/22587.Divine_Invasions https://www.goodreads.com/book/show/22587.Divine_In

I heartily recommend "Divine Invasions" by Sutin (https://www.goodreads.com/book/show/22587.Divine_Invasions https://www.goodreads.com/book/show/22587.Divine_Invasions) to anyone who would like to know more about Dick's life and personal issues, and the way these influenced his works.