"A Time to Die" is an exciting science fiction novel from the famous authors Calin and Harold. The book tells the story of a group of researchers who accidentally discover a mysterious source of invisible energy that allows time travel. The main characters of the book find themselves in the endless spaces of the past and future, where they face incredible challenges and dangers. Readers, together with the heroes, will feel the tension of every second, the atmosphere of mystery and the drive of adventure. "It's time to die" is a book that will not leave any fan of science fiction indifferent. An exciting plot, interesting characters and an unpredictable ending will turn reading this book into an exciting journey into the world of science and adventure.