"On business" is a book that is a real masterpiece in the spy detective genre. The author of this fascinating work is John le Carré, known for his ability to create complex intrigues and fascinating characters. In this book, readers will feel the atmosphere of the intelligence world, intertwined with dramatic events, betrayal and intrigue. The main character, a skilled spy, finds himself in heartbreaking situations where every step could be the last. The reader will have to shock his mind and solve the riddles of this fascinating story. "On business" is a book that fascinates with its tense atmosphere, refined writing style and unexpected plot twists. This book will not leave indifferent any fan of the genre of spy detective literature.