Artyom is 15 years old. This is the same age when you are not an adult, but also not small. It was in this, the last summer of childhood, that everything fell on Artyom at once: the betrayal of his father, who remained abroad after the tour, first love, friendship forever and quarrel forever. Artyom has only a skateboard - this is how in the 80s in the USSR they called skate, which Soviet teenagers had just begun to learn about. Now Artyom needs only one thing: by all means to win in street competitions.
Ambitious scientist Maksim Minaev is on the verge of discovery, thanks to which he can receive the Nobel Prize. In pursuit of fame, Maxim conducts a risky experiment on himself and shrinks to the size of an ordinary test tube. The young scientist desperately needs help, but his girlfriend abandoned him, his best friend betrayed him, and he has no one else to count on... Suddenly, the hero volunteers to help a 12-year-old boy chained to a wheelchair.