A musical film review. On the festive evening of May Day 1959, viewers will join the film's creators on a tour of Moscow, its streets and squares, meeting their favorite artists. And they will see how joyfully Muscovites celebrate the holiday of Spring!

Soviet Scientist Petrovich pioneers the way to the Sun, but his spacecraft is never heard from again. Later, Andrew's laboratory investigates means of protection from deadly radiation. Andrew repeats Petrovich's journey, and offers his life to rescue an orbiting science laboratory, which holds the solution to the problem.