Jurek K. the main protagonist of this action comedy is a nice, thirty year old taxi driver. He is an average man with exceptionally bad luck. One day Jurek’s boring existence dramatically changes: he is arrested as a professional hit man nicknamed "Killer". Shy, a bit lost, sometimes funny Jurek starts a new life as a killer of international fame. He is admired not only by the prisoners but also by policemen and prison guards. Women are also interested in him... When Jurek is set free by the gangsters, gets to know them a little better and realizes why they helped him out of the prison, he changes his attitude to being "a start". He manages to cheat the bosses of the gang. After surviving many dangerous situations, car chases and other adventures Jurek wants to be himself again. But there are people for whom he is still a dangerous criminal - a perfect (well almost) "killer".