Comical fantasy about life, love and death of the famous Baron Munchausen, who lived in the XVIII century and became the hero of numerous humor books and stories, based on the characters and episodes of the famous novel by R. Raspe, but in fact it is an independent work. "A thinking man simply must occasionally lift his hair up" - It seems that the movie authors manage to do that. Baron wants to marry his beloved Martha, but the church refuses to marry them, since he has a living wife, who has been "pacifying him for 20 years". Tired Martha wants Baron to become like everyone else, but Baron does not want it, and can not do this. Duke will allow the marriage only if the baron confirms in writing that all his stories are false, and he is an ordinary man.