The series is about a secret service that tracks illegal movements over time. Despite the bans on special services, the scientist Stern, driven by ambition, puts his time machine program on the Internet. Literally after a few hours, the link is deleted. But tens of millions of people have already downloaded it! Now everyone on Earth has it, and it may be a real disaster! In order to save the planet from chaos, a special secret service to monitor the inviolability of temporary space – the “frontier of time” – has been created around the world. Including in Russia. The best agents and analysts in the country have been selected from the special forces. All violations are followed up and severely punished. All operations are strictly classified. To find the criminal, the task force will have to prosecute him. And it’s not that simple: arousing suspicion in the past is a deadly danger.