The author of this book, retired KGB colonel, veteran of foreign intelligence Oleg Nechiporenko, met with various people in the course of his service. Among them was the assassin of American President Lee Harvey Oswald. So, while investigating the tragic events in Dallas, the author uses not only the results of similar foreign and domestic research, but his own memories and impressions. The book presents previously classified materials, unique Soviet and American documents relating to the Texas assassination, and examines new versions of the assassination attempt on John Kennedy. Who was Lee Harvey Oswald: an agent of the Soviet intelligence services or a lone killer? A KGB colonel lifts the iron curtain over this 50-year-old mystery.