Null-ABC is a science fiction novel by H. Beam Piper and John J. McGwire. The book tells about the adventures of the main character, who finds himself in a strange world where different realities and timelines intersect. He tries to solve the mystery of the zero letter "ABC", which leads to new and unexpected discoveries. The book captivates with its atmosphere of mystery and philosophical reflections on the nature of time and space. "Null-ABC" is an exciting journey into the world of fiction, which will leave the reader feeling a mixture of curiosity and the unknown, delving into the mysticism and mysteries of the world created by the imagination of the great masters of the genre.