"Day One (15.1)" is an exciting science fiction book written by a famous writer. This book tells about incredible events that take place in the future, when humanity is faced with the danger of external intellectual aggression. The main character finds himself in the very center of events and is forced to make important decisions that will determine the fate of the whole world. The book captivates from the first pages and keeps you in suspense until the last. "Day One (15.1)" is a book that will not only entertain you, but also make you think about the most important questions of life and the existence of humanity.