The book "Eternal" by Frank Belknap Long is an exciting sci-fi journey into the world of the future, where reality is intertwined with fantasy. The main character accidentally gets into another time stream and encounters unusual creatures that exist in parallel dimensions. The author helps the reader immerse himself in the atmosphere of the future, where time is only an illusion, and reality is a concept that can change at the will of each being. "Eternal" is a book that will delight all lovers of science fiction and mysterious adventures.