Alexander Phosphorin, St. Petersburg programmer with a rare voice - soprano - ends up in Rome of the 18th century. The soloist of the Sistine Chapel, Domenico Maria Cassini, comes to his aid, offering to shelter him free of charge and pump vocal skills. Alexander will become a soloist of Capella, be expelled from there for dissent, make his debut in a female role on the opera stage and meet a distant ancestor - a veteran of the Northern War. And, of course, find your unusual but true love.