Ошибка ценой в неделю

It all starts on Red Partisans Street in St. Petersburg, where, during a walk, Pavel, Bulldozer, and Lyonya find unusual crystals. Pavel takes them for himself under the pretext of scientific experiments in order to study them. Upon studying them, they revealed the ability to show the past or any other time period. Pavel is consumed by the desire to travel to 2025 for one single purpose: to verify these mystical properties and gain worldwide fame with this discovery. Having spent the entire summer on development, he sets off on his journey, but, as it usually happens, he ends up somewhere entirely different from where he intended...

Will Pavel be able to sort out his problems on his own, or will help come to him from the outside?