In this novel, Alexandra Marinina remains true to herself — precise psychology, sharp social instincts and tenacious detective nerve. However, for the first time, the author weaves a storyline from the future into the narrative. This makes it possible to look at a crime the way it will be seen decades later, when no one needs the truth anymore. The year 2024. A double tragedy in Moscow: a young woman, the author of a popular video blog about telephone scams, was killed. And her neighbor, a retired police colonel, was found hanged in his own apartment. The official version: murder and suicide. The case is closed quickly and conveniently. Too convenient… After 66 years, the son of the famous writer Strazhalkovsky wants to get to the bottom of the truth. Not out of a thirst for justice, but for the sake of republishing the book that brought his family fame and money, where one of the chapters is devoted to this story. The republication requires "clarifying the facts." He hires agent Evgeny Bocharov to travel back in time. In 2090, Tunnel technology allows time travel and observation, but not interference. The mercenary is being trained by Nayana, a young instructor for whom the case becomes personal much sooner than she has time to realize it. Meanwhile, someone very influential does not want this "flight" to take place....