The Croatian series "Uspjeh" revolves around several completely different individuals who are not connected in any way except for their involvement in a terrifying unsolved crime. The events unfold in the ancient city of Zagreb, where a series of random circumstances bring together Christian, Blanka, Vinka, and Harris. They all find themselves in the wrong place at the wrong time and become involuntary accomplices to a murder. They agree never to see each other again and not to tell anyone about it, but fate has its own plans...