Spiritism is a religion that believes in the power of spirits and angels. The main book of spiritism is called the Spirits' Book and it was written in 1857 by a French teacher and spiritualist named Allan Kardec. The book explains the teachings of spiritism, including the existence of an afterlife, the power of communication with spirits and angels through mediums, and the possibility of reincarnation. It also offers advice on how to live a good life, including loving others, being charitable, and cultivating virtues.