Detective Zen is sent to a remote village to re-investigate a murder, which may spark a political scandal. Zen is under pressure from the politicians and the Chief of Police, but he would rather be spending time with Tania, the Chief's beautiful assistant. Meanwhile, a gangster is after Zen, seeking revenge.

The death of a famous aristocrat, Umberto Ruspanti, leads Detective Zen into the shadowy world of The Cabal - an organisation more powerful and secret than the Mafia. The Ministry want a quick verdict of suicide, but Zen's not so sure. Meanwhile, things are looking up with Tania.

After industrialist and political party funder Ruggerio Miletti is kidnapped, the Ministry turn to Aurelio Zen, to get him back alive at any cost.