The Quincunx of Time
James Blish
 Capt. Robin Weinbaum of Earth Security submits to a request for an interview from Dana Lje, a video commentator, mostly because she can and has made his life difficult with her reporting of Security lapses, especially in a recent case involving the Government of Erskine, another planetary system. Ms. Lje reveals that she has received a communication from an outfit calling itself "Interstellar Information Ltd." about an incident in a star system so far away that even by a faster-than-light ship, no message could return from it in less than two months. The incident in fact is due to take place in the next few days. The communication also alleges that there is a new device aboard the ship, and gives the name of the device. When Weinbaum hears the name—the Dirac communicator—he is forced to believe that Interstellar Information have access to information even he doesn't have. He brings in Dr. Thor Wald to explain the Dirac device to Dana Lje. She agrees to play along with Interstellar and its owner, J. Shelby Stevens, to let Security find out how the company gets its information. A long investigation turns up exactly nothing. Even when J. Shelby Stevens allows an interview, under the conditions of so-called "stoolie's arrest" in which he voluntarily places himself in custody for interview, with a guarantee of being set free immediately afterward, there is no progress. The only result is that Stevens predicts the date of their next meeting. Weinbaum uses the Dirac device to communicate with his agents, even though he suspects the communications may not be secure. Each audiovisual message is preceded by a loud beep and burst of visual static, which is so annoying that Weinbaum orders it edited from the tapes he reviews. Finally Weinbaum discovers who Stevens really is, and to his amazement the day this happens is the exact day Stevens predicted they would meet again. He orders his agents to arrest the miscreant. The explanation he gets is this: the beep that he found so annoying represents all the messages ever sent, or that ever will be sent, using the Dirac device. With proper techniques, it is possible to extract any message, whether it be recent, or far in the future. Weinbaum realizes that this is an incredible and dangerous thing. On the one hand he can be ready for any hostile act on the part of Earth's enemies, but on the other he may, by choosing some events over others, affect the course of future history. The final chapters of the book are a long and well-informed discussion on free will and determinism (the preface of the novel has a quote on the subject from philosopher William James). Eventually Weinbaum decides that the best choice is no choice at all. If information in the beep states that something will happen, then his agents must make sure that it happens. He calls this principle "Thy will, not mine".